find the roots of 2x^2+11x-21=0
by factorisation method
with explation
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2x^2+11x-21=0
2x^2+(14-3)x-21=0
2x^2+14x-3x-21=0
2x(x+7)-3(x+7)=0
(x+7)(2x-3)=0
x+7=0
x= -7
2x-3=0
2x=3
x=3/2
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