CPM Homework Help : PCT Problem 1-24

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1-24.

Suppose $f\left(x\right) = 2x^{2} − 3$ , find:

$f\left(4\right)$
Hint (a):
Substitute $4$ for every $x$ in the function.
Step (a):
$f\left(4\right) = 2\left(4\right)^{2} − 3$

$f\left(−5\right)$
Hint (b):
Use ( ) when substituting to avoid errors.
Step 1(b):
$f\left(−5\right) = 2\left(−5\right)^{2} − 3$

$f\left(3b\right)$
Hint (c):
Follow the same steps for (b).

$f\left(a + 1\right)$
Hint (d):
Do not forget the middle term when expanding $\left(a + 1\right)^{2}$ .
Answer (d):
$2a^{2} + 4a − 1$

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