factorise 4x^2 - 12x - 91
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4x²-12x -91=0
⇒4x²-26x +14x -91=0
⇒2x(2x-13) +7(2x-13)=0
⇒(2x+7)(2x-13)=0
⇒(2x+7) =0 or (2x-13)=0
x= -7/2 or 13/2
⇒4x²-26x +14x -91=0
⇒2x(2x-13) +7(2x-13)=0
⇒(2x+7)(2x-13)=0
⇒(2x+7) =0 or (2x-13)=0
x= -7/2 or 13/2
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4x^2-12x-91
sum= -12 , product=-364
=4x^2+14x-26x-91
=2x(2x+7)-13(2x+7)
=(2x-13)(2x+7)
sum= -12 , product=-364
=4x^2+14x-26x-91
=2x(2x+7)-13(2x+7)
=(2x-13)(2x+7)
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