Question

If f is continuous and (integral of f(x)dx from 0 to 4 is = 10), find the integral of (f(2x))dx from 0 to 2.

Answer 1

What I did:

for first integral:
F(4)-F(0)=10
therefore, F(0)=F(4)-10

for second integral:
F(2(2))-F(2(0))
= F(4) - F(4) + 10
=10

But the answer is 5. Where did I go wrong? Any help would be appreciated :)

Answer 2

divide by 2