(x + 7)2 = 5 x + 7 = ±√5 x + 7 - 7 = -7 ± √5 x = -7 ± √5
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5.
2x2-5 = 0 +5 +5 2x2 = 5 /2 /2 x2 = 5/2 sqrt(x2) = sqrt (5/2) x = sqrt(5/2) Ps: Sqrt means square root
x=5
12x = 11x - 5, subtract both sides by 11x x = -5
x2 - 5x = 0Factor the left side:x (x - 5) = 0x = 0x = 5