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x(-7+x)(x+7)=-120
We move all terms to the left:
x(-7+x)(x+7)-(-120)=0
We add all the numbers together, and all the variables
x(x-7)(x+7)-(-120)=0
We add all the numbers together, and all the variables
x(x-7)(x+7)+120=0
We use the square of the difference formula
x^2-49+120=0
We add all the numbers together, and all the variables
x^2+71=0
a = 1; b = 0; c = +71;
Δ = b2-4ac
Δ = 02-4·1·71
Δ = -284
Delta is less than zero, so there is no solution for the equation
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