Math Functions Question

Test Preparation SAT Subject Test Preparation
1

<p>Eg. If f(7x + 5) = 14x + 10 for all real x, what is f(x)?</p>

<p>Sparknotes gives the following explanation:
To discover what f(x) is, look where f maps 7x + 5. Simply put, f doubles the input: f(7x + 5) = 2 (7x + 5). Therefore, f(x) = 2x for all x.</p>

<p>But what if it is a more complicated function? Is there a more reliable way of getting the answer?</p>

2

<p>Backsolve.</p>

3

<p>lol i just did that saame practice test awhile ago haha, ran out of time though :(</p>

4

<p>can someone explain how to backsolve it? thanks!</p>