if f(x)=x²+x-1 and g(x)=2x+7 then find fog ang gof also find fog(-2) and gof(1)
Answers
Answered by
2
Answer:
fog=f[g(x)]
=(2x+7)^2+(2x+7)-1
=4x^2+30x+55
fog(-2)=4(-2)^2+30(-2)+55
= 16-60+55
=11
gof=g[f(x)]
=2(x^2+x-1)+7
=2x^2+2x+5
gof(1)=2(1)^2+2(1)+7
= 11
Answered by
4
Answer:
fog=f(g(x)]
=(2x+7)^2+(2x+7)-1
=4x^2+30x+55
fog(-2)=4(-2)^2+30(-2)+55
= 16-60+55
=11
gof=g[f(x)]
=2(x^2+x-1)+7
=2x^2+2x+5
gof(1)=2(1)^2+2(1)+7
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