check whether FOG=GOF. f(x)=4x2-1,g(x)=1+x
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fog = f(g(x))
= f(1+x)
=[ 4(1+x)^2]- 1= 4(1+2x+x^2)-1
= 4+8x+4x^2 -1
= 4x^2 +8x +3
gof= g(f(x))
= g(4x^2 -1)
= 1+ 4x^2 -1 = 4x^2
therefore fog is not equal to gof
alwinalan:
thank u so much
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