Question

A portion of the graph of f(x) = −x2 − 10x − 21 is shown. Which of the following describes all solutions for f(x)? a partial parabola opening down and passing through negative 7 comma 0 and negative 3 comma zero with endpoints at negative 8 comma negative 5 and negative 2 comma negative 5 (x, −x2 − 10x − 21), where −7 ≤ x ≤ −3 (x, y), where −7 ≤ x ≤ −3 (x, −x2 − 10x − 21), where −8 ≤ x ≤ −2 (x, y) for all real numbers

Answer 1

(x, −x2 − 10x − 21), where −8 ≤ x ≤ −2

Explanation:

because x is greater then it.

Answer 2

Let's solve for solutions i e zeros

• -x²-10x-21=0
• x²+10x+21=0
• x²+7x+3x+21=0
• (x+7)(x+3)=0
• x=-7 OR -3