80 x 6 = 480 take away 1 x 6 leaves 474. There's always a quick way!
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X squared = x+6 6+x=x squared X=6
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(x + 10)/2 = (x - 6)/x. Multiply both sides by 2x to produce: x2 + 10x = 2x - 12 Rearrange and collect like terms to produce: x2 + 8x + 12 = 0 Factoring produces: (x + 6)(x + 2) = 0, which is true whenever x = -6 or x = -2 Check: for x - -6: (-6 + 10)/2 = 2; (-6 - 6)/-6 = -12/-6 = 2 (-2 + 10)2 = 4; (-2 - 6)/-2 = -8/-2 = 4.