(x^2)-23x=0
Start by factoring out an x:
(x)(x)-23x=0
x(x-23)=0
Set each quantity to 0 and solve for x:
x(x-23)=0
x=0 x-23=0
x-23+23=0+23
x=23
Therefore x=0, x=23
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x: x2 - 81 = 0
x3=x2 x3-x2=0 Factor out x2 x2(x - 1) = 0 If x2=0 then x=0. If x - 1 = 0 then x = 1. Therefore the number is 0 or 1.
x=8
x2 - 7x = 60 x2 - 7x - 60 = 0 (x - 12) (x + 5) = 0 x = 12 or x = -5
x2 = 8xx2- 8x = 0x(x - 8) = 0x = 0 ;x - 8 = 0x = 8