X squared + 2x - 15 = 0

Question

Mcknight

Mathematics

18 August, 11:30

X squared + 2x - 15 = 0

+5

Answers (2)

Know the Answer?

Bronson Pierce · Answer 1

3 or - 5

Step-by-step explanation:

x^2 + 2x - 15 = 0

To solve this you need to factorise:

(x + 5) (x - 3) = 0

Now find the x value for each of these brackets

(x + 5) = 0 or (x - 3) = 0

x = - 5 or x = 3

Josie Adkins · Answer 2

Step-by-step explanation:

x=-5 or x=3

Explanation:

the factors of - 15 which sum to + 2 are + 5 and - 3

⇒ (x+5) (x-3) = 0

equate each factor to zero and solve for x

x+5=0⇒x=-5

x-3=0⇒x=3