Let x^2+2x-15 = 0 use quadratic formula to find the roots. (roots are whole numbers)

Question

Mathematics

Burke

10 October, 05:42

Let x^2+2x-15 = 0 use quadratic formula to find the roots. (roots are whole numbers)

+4

Answers (1)

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Ethan Faulkner · Answer 1

Hello!

We have:

X^2 + 2x-15 = 0

Where:

a = 1

b = 2

c = - 15

Delta = b^2 - 4. a. c

D = 2^2 - 4.1. (-15)

D = 4 + 60

D = 64

We know,

x = [ - b+/-Raiz (delta) ]/2a

x = [ - 2 + / - Raiz (64) ]/2

x = [-2 + / - 8]/2

Then,

x' = (-2-8) / 2 - 5

And

x" = (-2+8) / 2 3