factorise 4x^3+12x^2+6x+18
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4x³+12x²+6x+18
=4x²(x+3)+6(x+3)
=(x+3)(4x²+6)
=(x+3){2(2x²+3)}
=2(x+3)(2x²+3)
=4x²(x+3)+6(x+3)
=(x+3)(4x²+6)
=(x+3){2(2x²+3)}
=2(x+3)(2x²+3)
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