It's a quadratic expression which can't be factorized because its discriminant is less than zero.
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4x2+49x+90 = (4x+9)(x+10) when factored
ANSWER: -4X2 -8X-4x (x+2)= (-4x * x) + (-4x*2)= -4X2 -8X
4x2+12x = 4x(x+3) when factored
4x2-4x-120 = (2x+10)(2x-12) when factored
4x2 - 23xy + 15y2 = (4x - 3y)(x - 5y)