solve by factorisation method 8x2-22x-21=0
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12
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)
Answered by
4
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)
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