factorise 4 x square + 12 x + 9 find the roots of the equation
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4x^2+12x+9=0
4x^2+6x+6x+9=0
2x(2x+3)+3(2x+3)=0
2x+3=0,2x+3=0
2x=-3,2x=-3
x=-3/2,-3/2
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