x2 - 4x = 8
x2 - 4x + 4 = 8 + 4
(x - 2)2 = 12
x - 2 = +&- sq. root of 12
x = 2 +&- 2(sq. root of 3)
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x=4 or x=-4
12x = 36
y=(-1) x=(2)
x = -8 already is a solution. If an equation has been changed until the value of x is found, and this value is accurate to the original equation, then the equation has been solved.
y / 8 = 56 So multiply both sides by 8 to get y = 56 * 8 So y = 448