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Functions

Quick questions on Function notation and evaluation - ACT Mathematics

3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is q1?
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If f(x)=5−2xf(x) = 5 - 2x, find f(−3)f(-3). [1 point]
What is q2?
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If f(x)=x2f(x) = x^{2} and g(x)=x−1g(x) = x - 1, find g(f(3))g(f(3)). [1 point]
What are sign errors with negative inputs?
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Substitute in parentheses: (−2)2=4(-2)^{2} = 4, and −4(−2)=+8-4(-2) = +8.

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