Question

Please halpp i need this done soon

Answer 1

Answer:

B. x² - 3x - 40

Step-by-step explanation:

The factored form of quadratic function:

$y=a(x-x_1)(x-x_2)$

where x₁ and x₂ are the roots of the quadratic function and the solutions of the corresponding quadratic equation.

We have x₁ = 8 and x₂ = -5. Substitute:

$y=a(x-8)(x-(-5))$

$y=a(x-8)(x+5)$        use FOIL: (a + b)(c + d) = ac + ad + bc + bd

$y=a[(x)(x)+(x)(5)+(-8)(x)+(-8)(5)]$

$y=a(x^2+5x-8x-40)$

$y=a(x^2-3x-40)$

For a = 1 we have the equation:

B. x² - 3x - 40