factorise: 2 a ^ { 2 } + 9 a + 7
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Step-by-step explanation:
2x^2–5x-7 = 0
The product of 2 and 7 is 14. The difference of 7 and 2 is 5.
So we write the equation as
2x^2+2x-7x-7 = 0
2x(x+1)-7(x+1) = 0
(2x-7)(x+1) = 0 are the factors desired.
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