Q: 2x2 plus 6x-8 equals 72

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Minus 61 (-61)

72 + 72 = 144

2x2 + 6x - 8 = 72 ∴ 2x2 + 6x + 64 =0 ∴ x2 + 3x + 32 = 0 This can not be factored, as x is not equal to any integer. Using the quadratic equation, we find that: x = -3/2 ± √119 / 2i

49 + 72 + 68 = 189

180+72=252

72+30=102

You would formulate this problem X/100 * 150 = 72 and solve for X.

72 !

72

132

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

It is the property of n as the additive identity.