Question

Evaluate the Integral

Answer 1

Let me show my work in the following post, the answers say that it is 55/63 but I cannot obtain that denominator.

Answer 2

distribute the x.

Answer 3

Yeah, you got it. \[\frac{3}{7}+\frac{4}{9}=\frac{27+28}{63}\]

Answer 4

there is a nice trick for multiplying a number by 9 :

7*9 = 7(10-1) = 70-7 = 63