Factorise : x^2 + x by 4 - 1 by 8
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=x^2+x/4 - 1/8
=8x^2+ 2x -1 /8 =0
=8x^2+4x -2x -1
=4x (2x+1)-1 (2x+1)
= (4x-1) (2x+1)
therefore x=1/4 or x= -1/2
=8x^2+ 2x -1 /8 =0
=8x^2+4x -2x -1
=4x (2x+1)-1 (2x+1)
= (4x-1) (2x+1)
therefore x=1/4 or x= -1/2
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