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2x2 - 6x - 25 = 0. Solutions are 5.34 and -2.34
x2 + 6x = 7 ⇒ x2 + 6x + 9 = 7 + 9 ⇒ (x + 3)2 = 16 ⇒ x + 3 = ±4 ⇒ x = -7 or 1
-10 = 6x - 16, or 16 - 10 = 6x, or x = 1.
None but it can be simplified to: 162x-468
x2 - 6x - 16 = (x - 8)(x + 2)