What is a removable discontinuity, and how can it be recognized?
Learn to spot a hole by checking the two-sided limit, factoring common terms, and keeping the limit separate from the function’s actual value.
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How can I choose a constant to make a piecewise function continuous?
Match the pieces’ limits at the joining point, then solve for the constant that makes their shared limit equal the function’s value there.
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What does a limit at infinity tell me about a function’s long-run behavior?
Understand how a finite limit at infinity describes a function’s long-run values and horizontal asymptote, with a worked example.
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How can a table of values suggest a limit without proving it?
Build a two-sided table, read what it suggests about a limit, and see why finitely many values are evidence—not proof.
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How can I tell whether a graph transformation changes a function's domain or range?
Track what happens to inputs and outputs separately, then use a restricted square-root example to find the transformed domain and range.
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How do stretches and reflections change a function graph?
Compare vertical stretches and reflections with input changes, then track points on a square-root graph to see each transformation.
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How can I tell whether two function formulas define the same function?
Use a two-part test: compare domains, then compare outputs for every allowed input. A worked example shows how cancellation can hide a domain difference.
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How do quotient and power rules change a logarithmic expression?
Learn how a quotient becomes a difference and a power becomes a coefficient, with examples that distinguish rewriting expressions from solving equations.
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How do I solve a logarithmic equation and check for invalid answers?
Follow the domain first, solve a logarithmic equation step by step, then test every candidate in the original equation.
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How can I use the product rule for logarithms without changing the base?
Learn when to split a logarithm of a product, keep its base unchanged, and spot why the same move fails for a sum.
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How can I solve a simple exponential equation by rewriting both sides with the same base?
Learn to rewrite both sides with a shared base, solve the resulting exponent equation, and check your answer in the original equation.
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Why must a logarithm's input be positive?
See why real logarithms accept only positive inputs, and use the exponential form to check examples such as log₂8, log₂0, and log₂(−8).
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Why does an exponential graph approach an asymptote without reaching it?
Use a value table and the graph of f(x)=2ˣ to see why y=0 is an asymptote, while (0,1) is the y-intercept.
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How can I calculate repeated percent change with an exponential rule?
Convert a repeated percent increase or decrease into a multiplier, apply it once per step, and check your result.
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How do I simplify a radical when the number has a perfect-square factor?
Use a perfect-square factor to simplify a square root, then check your result by squaring it. Includes worked examples and a reusable check.
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Why can an even root of a negative number fail to be real?
See why no real number can have a negative even power, compare with odd roots, and check examples step by step.
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How can I simplify a power with a fractional exponent?
Translate the denominator into a root and the numerator into a power, then simplify step by step with positive-number examples.
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Why does a zero exponent give a value of one?
See why each step down in the exponent divides by the base, and learn why the zero-exponent rule is stated only for nonzero bases.
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What does the y-intercept tell me about a linear function?
Learn to read the y-intercept as the function’s value at x = 0, distinguish it from slope, and label it on a graph.
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What does a vertical line say about whether a slope is defined?
Compare vertical and horizontal lines using rise over run, then use points to identify whether a slope is zero or undefined.
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How can I sketch a straight-line function from its slope and intercept?
Use the intercept as your starting point, then follow the slope’s rise and run to plot more points and draw the line.
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How are a function's graph and its inverse related?
See why an inverse graph reflects across y = x, how points switch coordinates, and why a function may need a restricted domain.
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How can I find the slope of a line from its equation?
Learn to identify the slope in slope-intercept form or rearrange a linear equation first, while keeping slope separate from the y-intercept.
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How can I find the domain of a composition of functions?
Check that inputs are allowed by the inner function and that its outputs are allowed by the outer function, with a worked example.
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