Question

Rewrite the equation by completing the square. f (x) = x^2 + 20x - 86

Answer 1

Answer:

f(x) = (x+10)^2 - 86

Step-by-step explanation:

1. f(x) = x^2 + 20x - 86
2. f(x) = x^2 + 20x + 100 - 86 (because (20/2)^2 = 100)
3. f(x) = (x+10)^2 - 86

Completing the square means you do (b/2)^2 where b is: a^2x + bx + c.