The quadratic expression x2+6x+8 when factorised equals (x+2)(x+4)
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-x2 + 6x + 16 = -(x2 - 6x - 16) = -(x - 8)(x + 2) = -(8 - x)(x + 2)
2x+6x=-9 => 8x=-9=> x=-8/9
4x+8
x2 + 6x + 1 = 0 x2 + 6x + 9 = 8 (x + 3)2 = 8 x + 3 = ± 2√2 x + 3 = -3 ± 2√2 x ∈ {-3 - 2√2, -3 + 2√2}
x = 2 and x = 4