(2x - 1)(2x + 5)
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4x2-20+25 = (2x-5)(2x-5) when factored with the help of the quadratic equation formula.
If you can't factor it easily, use the quadratic formula.
4x2+49x+90 = (4x+9)(x+10) when factored
4x2+12x = 4x(x+3) when factored
It can't be factored because the discriminant is less than zero.