Question

What is the value of h(-7)? h(x) = [3x] - 1 A. 22 B. -20 C. -22 D. 20

Answer 1

For this case we have to find the value of$h (x)$when $x = -7$, for this we must replace the value of $x = -7$ in the given equation. We have:

$h (x) = | 3x | - 1$

Substituting $x = -7$

$h (-7) = | 3 (-7) | - 1$

Considering what $+ * - = -$

$h (-7) = | -21 | -1$

Taking into account that by definition; $| -a | = a$

$h (-7) = 21-1\\h (-7) = 20$

So, $h (-7) = 20$

Answer:

Option D

Answer 2

substitute -7 in for x

f(-7) = (3*-7) -1

     = -21-1

      = -22

Choice C