Composite Identity

Algebra Level 1

If f ( x ) = x 2 + 4 x , f(x)=x^2+4x, what is the value ( f ∘ I ) ( 7 ) , (f \circ I)(7), where I I is the identity function?

75 77 79 73

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Mahindra Jain by Mahindra Jain

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1 solution

Joydhi Telmo
Mar 1, 2014

F(x) = x^2 + 4(x)

x=7

F(7) = 7^2 + 4(7)

F(7)=49+28

F(7)= 77

2 Helpful 0 Interesting 0 Brilliant 0 Confused

It's good to note that the identity function is I ( x ) = x I(x)=x

Justin Wong - 7 years, 1 month ago

Ihouldn't the answer be 539 as we still have to multiply 7 to 77 as we have to find (f.I)(7)= 77 x 7

Akhilesh Prasad - 7 years, 1 month ago

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