572
Because 2x11=22 and 13x2=26 and 22x26=572.
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13x + 15 = 11x - 5 2x = -20 x = -10
it equals 13X.
13x
x + 13x + 10x = 50 - 6
-x2 - 11x + 26 = -(x2 + 11x - 26) = -(x2 - 2x + 13x - 26) = -[ x(x - 2) + 13(x - 2) ] = -(x + 13)(x - 2) = (x + 13)(2 - x)