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4x-1 = 6x-15 4x-6x = 1-15 -2x = -14 x = 7
4x - 1 = 9(+ 1 on both sides)4x = 10(Divide both sides by 4)x = 2.5
x2 + 4x = 1 x2 + 4x - 1 = 0 in the quadratic formula (b2+- Sqr(4ac))/2a, a = 1 b = 4 c = -1 so x = 8 +- i
6x - 30 = 4x + 1 Subtract 4x + 1 from each side giving 2x - 31 = 0 so x = 15.5
x2 + 4x + 3 = 0 (x + 1)(x + 3) = 0 x ∈ {-3, -1}