One of the solutions to x^2-2x-15=0

asked Nov 1, 2019 174k views

3 votes

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5 votes

x^2-2x-15=0
or, x^2-5x+3x-15=0
or, x(x-5)+3(x-5)=0
or, (x-5) (x+3)=0
Either, Or,
x-5=0 x+3=0
x=5 x= -3

Bzg answered Nov 3, 2019

by Bzg

4.8k points

2 votes

Factor the equation out into (x-5)(x+3)

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

x=5, -3

Kpw answered Nov 6, 2019

by Kpw

4.5k points

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