Question

solve by factorisation method 8x2-22x-21=0

Answer 1

this is done as

8x²-22x-21

8x²-(28-6)x-21

8x²-28x+6x-21

4x(2x-7)+3(2x-7)

(4x+3)(2x-7)

Answer 2

Answer:

=8x²-22x-21

=8x²-28x+6x-22

factorising them

=4(2x²-7)+3(2x-7)

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

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