FACTORISE USING SUITABLE GROUPING
9x^2+42x+49-84x
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given:-
9x² + 42x- 84x+ 49=0
9x²-42x+49=0
9x²-21x-21x+49=0
3x(3x-7)-7(3x-7)=0
(3x-7) (3x-7)=0
3x-7=0. 3x-7=0
3x=7. 3x=7
x=7/3. x=7/3
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