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X plus x minus 30 equals zero What's the X?
Solution 1 (matching method): X & # 178; + X-30 = x & # 178; + 2 × (1 / 2) x + (1 / 2) & # 178; - (1 / 2) & # 178; - 30 = 0 (x + 1 / 2) & # 178; = 30 + 1 / 4 (x + 1 / 2) & # 178; = 121 / 4x + 1 / 2 = ± 11 / 2x = (- 1 ±) / 2x1 = (- 1 + 11) / 2 = 5x2 = (- 1-11) / 2 = - 6 solution 2 (factorization): X & # 178; + X-30
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