7.2 x 12 x 0.23 = 19.872
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-12x = 72 Divde both sides by -12 to find the value of x: x = -6
2x2 - 72 would be factored into (2x - 12)(x + 6) or (2x + 12)(x - 6) To double check, multiply each pair: (2x - 12)(x + 6) = 2x2 + 12x - 12x - 72 = 2x2 - 72 (2x + 12)(x - 6) = 2x2 - 12x + 12 x - 72 = 2x2 - 72
As an equation if: 6x = 72 then x = 12
x2 - 18x + 72 = 0 (x - 6)(x - 12) = 0 x ∈ {6, 12}
x=y-8 z=x+12