3xsquare+21x+36=0 factorise
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Step-by-step explanation:
3xsquare +21x +36=0
taking 3 common
3(x square + 7 x + 12)=0
x square + 7 x + 12=0
x square + 3 x + 4x + 12 = 0
x(x+3) +4(x+3)=0
(x+3)(x+4)=0
x= -3 and -4
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