Question

1. (4 ea) given the function $f(x) = 8x^2 - 3x$, find each of the following.

| b. $f(-4)$
| c. $f(-1.9)$

Explanation:

Step1: Substitute $x=-4$ into $f(x)$

$f(-4) = 8(-4)^2 - 3(-4)$

Step2: Calculate powers and products

$8(16) + 12 = 128 + 12$

Step3: Compute the final sum

$128 + 12 = 140$
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Step1: Substitute $x=-1.9$ into $f(x)$

$f(-1.9) = 8(-1.9)^2 - 3(-1.9)$

Step2: Calculate powers and products

$8(3.61) + 5.7 = 28.88 + 5.7$

Step3: Compute the final sum

$28.88 + 5.7 = 34.58$

Answer:

b. $140$
c. $34.58$