Question

Evaluate f(-2) for the function f(x)= -1/2x^2 + x + 1

Answer 1

Answer:

f(-2) = -3

Step-by-step explanation:

$f(x)=-\frac{1}{2} x^{2} +x+1$

Just plug in x = -2

$f(-2)=-\frac{1}{2} (-2)^{2} -2+1$

$f(-2)=-\frac{1}{2} (4) -1$

4 can be rewritten as $\frac{4}{1}$ or $\frac{8}{2}$ so it has a common denominator.

$f(-2)=-\frac{1}{2} * \frac{8}{2} -1$

$f(-2)=-\frac{4}{2} -1$

$f(-2)=-2-1$

$f(-2)=-3$