Factor: 4x^2+3x-27 ??????

(x+3)(4x-9)

I think you typed in the second one with a mistake but the answer as stated is

3xy(x-4y^2)

good luck

x's=[-3+&-(9+432)^1/2]/8=-3 & 9/4
=(x+3)(4x-9)



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3xy(x-4y^2)

1)
4x^2 + 3x - 27
= 4x^2 + 12x - 9x - 27
= (4x^2 + 12x) - (9x + 27)
= 4x(x + 3) - 9(x + 3)
= (x + 3)(4x - 9)

2)
3x^2y - 12xy^3
= 3(x^2y - 4xy^3)
= 3xy(x - 4y^2)