Question

Solve the equation x^2 + 5x = 0.
a)x = 0, –5
b)x = 0, 5
c)x = 1, –5
d)x = 1, 5

Answer 1

Dose it look like \(\large x^2+5x\)

Answer 2

test the first option
if x =0, then 0^2+5*0 =0 check
if x =-5, then (-5)^2 +5*(-5) = ??

Answer 3

well there are many ways to solve this problem but an easy way would be to plug in solutions. For the first one:
A) x=0,-5
x^2+5x=0
(0)^2+5(0)=0
0+0=0
0=0 good so far lets move on to -5
x^2+5x=0
(-5)^2+5(-5)=0
25-25=0
0=0
So A is the solution because both would work