Question

solve by factorisation method 8x^2 - 22x - 21 = 0

Answer 1

8x²-22x-21 = 0
8x²-28x+6x-21 = 0
4x(2x-7)+3(2x-7) = 0
(4x+3)(2x-7) = 0
x = -3/4 , 7/2

Answer 2

Answer:

$x=\frac{-3}{4},x=\frac{7}{2}$

Step-by-step explanation:

Given : $8x^2 - 22x - 21 = 0$

To Find:solve by factorisation method

Solution:

$8x^2 - 22x - 21 = 0$

$8x^2 - 28x+6x - 21 = 0$

$4x(2x - 7)+3(2x - 7) = 0$

$(4x+3)(2x - 7) = 0$

$(4x+3)=0,(2x - 7) = 0$

$x=\frac{-3}{4},x=\frac{7}{2}$

Hence  $x=\frac{-3}{4},x=\frac{7}{2}$