Answer
True.
Work Step by Step
True, this follows directly from the fundamental theory of calculus, part I.
After all:
$\int _a^b\:f\left(x\right)=F\left(b\right)-F\left(a\right)$
So, it follows:
$G(b) + F(b) = G(a) + F(a)$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.