Question

Solve, or determine the roots of the following quadratic equations by factoring.
a) 3x^2+15x=0
b)x^2-64=0
c)x^2-6x-27=0

Answer 1

a. x=0,-5

Answer 2

b. x=8,-8

Answer 3

c. x=9,-3

Answer 4

How'd you get that ?

Answer 5

a) x(3x+15)=0, so x=0 ; 3x+15=0; x=-5
b) x^2=64; x=sqrt(64); x=+8, -8
c) quadratic equation so; x=(-b+-sqrt(b^2-4ac))/2a

Answer 6

a. 3x(x-5)=0 => x=0,5 others are similar

Answer 7

Oh alright, thanks !