4 = 12 / 3 therefore 8-x must equal 3, so x has to equal 5.
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8x + 12 = 4x - 4 8x - 4x = -4 - 12 4x = -16 x = -4
-1
because 4+4+4=12
x=4, y=9 (4,9)
If you notice, 8x + 4 = 4(2x + 1), but there is an odd coefficient for x2, so there is guaranteed to be some remainder (that is 8x + 4 is not a factor of the polynomial): (24x3 - 5x2 - 48x - 8) ÷ (8x + 4) = 3x2 - 2x - 5 - (x2 - 12)/(8x + 4)