2xsquare - x - 21 factorise the question
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2x^2 - x - 21 = 0
=> 2x^2 - 7x + 6x - 21 = 0
=> x(2x - 7) + 3(2x - 7) = 0
=> (x + 3)(2x - 7) = 0
=> x = -3 or 7/2.....
Hope it helps......
=> 2x^2 - 7x + 6x - 21 = 0
=> x(2x - 7) + 3(2x - 7) = 0
=> (x + 3)(2x - 7) = 0
=> x = -3 or 7/2.....
Hope it helps......
Answered by
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2x^-x-21=0
2x^+6x-7x-21=0
2x(x+3)-7(x+3)=0
(x+3)(2x-7)=0
(x+3)=0 , (2x-7)=0
x=-3 , x=7/2
2x^+6x-7x-21=0
2x(x+3)-7(x+3)=0
(x+3)(2x-7)=0
(x+3)=0 , (2x-7)=0
x=-3 , x=7/2
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