3 years ago

Solve x2 + 2x – 15 = 0

Mathematics

2 answers:

OLga [1]3 years ago

4 0

X2+2x-15=0
2x+2x-15=0
4x-15=0
4x=15
so answer is x= 15/4

lana66690 [7]3 years ago

3 0

Answer:

x = - 5, x = 3

Step-by-step explanation:

Given

x² + 2x - 15 = 0

Consider the factors of the constant term (- 15) which sum to give the coefficient of the x- term (+ 2)

The factors are + 5 and - 3 , since

5 × - 3 = - 15 and 5 - 3 = + 2, so

x² + 2x - 15 = 0

(x + 5)(x - 3) = 0 ← in factored form

Equate each factor to zero and solve for x

x + 5 = 0 ⇒ x = - 5

x - 3 = 0 ⇒ x = 3

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