factorise it with solution 2xsquare +11x-21
Answers
Answered by
236
Hi Friend !!!
======================
2x²+11x-21
= 2x²+14x-3x-21
= 2x(x+7)-3(x+7)
= (2x-3)(x+7)
x = 3/2 ......OR......x = -7
Hope it helps u :-)
======================
2x²+11x-21
= 2x²+14x-3x-21
= 2x(x+7)-3(x+7)
= (2x-3)(x+7)
x = 3/2 ......OR......x = -7
Hope it helps u :-)
tejasri2:
plz brainliest if it helps u
ya i promise
tq
did it help u
ya
oo
tq
brainliest
ok
Answered by
69
Hi mate !!
Here's the answer !!
Equation = 2x² + 11x - 21
We can solve this question by method of splitting the middle term.
- 21 * 2 = - 42
So now 42 must be expressed in terms of two numbers which on adding or subtracting must give 11 as the answer.
So 14 and - 3 on adding give 11 as well as 14 * - 3 = - 42.
Hence the middle term can be splitted as:
2 x² + 14 x - 3 x - 21 = 0
Taking common divisors out we get,
2x ( x + 7 ) - 3 ( x + 7 ) = 0
=> ( 2x - 3 ) ( x + 7 ) = 0
=> 2x - 3 = 0 ; x + 7 = 0
On solving both we get,
x = 3 / 2 ; - 7
Hope my answer helped !!
Cheers !!
Here's the answer !!
Equation = 2x² + 11x - 21
We can solve this question by method of splitting the middle term.
- 21 * 2 = - 42
So now 42 must be expressed in terms of two numbers which on adding or subtracting must give 11 as the answer.
So 14 and - 3 on adding give 11 as well as 14 * - 3 = - 42.
Hence the middle term can be splitted as:
2 x² + 14 x - 3 x - 21 = 0
Taking common divisors out we get,
2x ( x + 7 ) - 3 ( x + 7 ) = 0
=> ( 2x - 3 ) ( x + 7 ) = 0
=> 2x - 3 = 0 ; x + 7 = 0
On solving both we get,
x = 3 / 2 ; - 7
Hope my answer helped !!
Cheers !!
Similar questions