Yes, 90 Is composite because 45 x 2 = 90
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3x2-39x-90 = (3x+6)(x-15) when factored
m2+m-90 = (m-9)(m+10) when factored
4x2+49x+90 = (4x+9)(x+10) when factored
It can be factored as the SQUARE OF A BINOMIAL
16m-28m factored = -12