Use the grouping method to factor 4x^3 + 20x^2-3x-15

a) (x-5) (4x^2+3)

b) (x+5) (4x^2-3)

c) 2x (x+1) (2x-15)

d) (x^2-5) (4x+3)

What is the answer for this 90 = 6 (d - 84)

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