Question

If h(z)= (0.5)(z-7)(z+7), find h(-3)

Answer 1

h(z)= (0.5)(z-7)(z+7)

the first step to find h(-3) is erase the "z" and put in -3
can you do that? what do you get ?

Answer 2

you should get
h(-3)= 0.5(-3-7)(-3+7)
remember order of operations: do the stuff in parens first:
-3-7= -10
and -3+7= 4
so
h(-3) = 0.5*-10*4
now multiply the 3 numbers.