factorize
2x² – √7x - 7
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Answered by
0
Answer:
2x^2-2×7^1/2x+7^1/2-7
2x (x-7^1/2)+7^1/2 (x-7^1/2)
(x-7^1/2)(2x+7^1/2)
Answered by
9
ANSWER:
GIVEN:
- 2x²-√7x-7
TO FIND:
- Factorise the above expression.
SOLUTION:
= 2x²-√7x-7
= 2x²-2√7x+√7x-7
= (2x²-2√7x)+(√7x-7)
= 2x(x-√7)+√7(x-√7)
= (x-√7)(2x+√7)
IF THE QUESTION ASK TO FIND THE VALUE OF 'x' Then:
=>(x-√7)(2x+√7) = 0
Either (x-√7) = 0
=> x = √7
Either (2x+7)= 0
=> 2x = (-7)
=> x = -7/2
NOTE:
- (a+b)² = a²+b²+2ab
- (a-b)² = a²+b²-2ab
- (a+b)³ = a³+b³+3ab(a+b)
- (a-b)³ = a³-b³-3ab(a-b)
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