x2 + 8x = -15
x2 + 8x + 15 = 0 since 15 = 5 x 3 and 5 + 3 = 8, then
(x + 5)(x + 3) = 0
x + 5 = 0 or x + 3 = 0
x = -5 or x = -3
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x2 + 8x + 15 = (x + 3) (x + 5).
(x-3)(x-5) = 0
8x+39 = 2x-15 6x = -54 x = -9
2x + 15 = 8x + 43 -6x = 28 x = -6 / 28 = -3 / 14
8x plus 4y equals 5 is 8x + 4y = 5.