-6x+72=x then -7x=-72 so x=72/7
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6x + 10 = 72 6x = 72 - 10 x = 62/6 x = 10.3333
2x2+6x-8 = 72 2x2+6x-8-72 = 0 2x2+6x-80 = 0 (2x-10)(x+8) = 0
(x + 12)(x - 6) = 0 x = 6 or -12
5x + x - 6x + 2x = 2x
The quadratic expression x2+6x+8 when factorised equals (x+2)(x+4)