Question

If f(x) = x2 + 4x + 5 and g(x) = 2x + 1, prove that
f(1) - 2g(2) = 0.
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Answer 1

Answer:

f(x)=x²+4x+5.

f(1)=(1)²+4(1)+5.

=1+4+5.

=10.

g(x)=2x+1.

g(2)=2(2)+1.

=4+1.

=5.

f(1)-2g(2)=10-2(5).

=10-10.

=0.

So, f(1)-2g(2)=0.