Problem
1 Which of the following is an equivalent form of the expression $15 x+24 a x$ ? A) $39 a x^{2}$ B) $39(a+2 x)$ C) $(5+8 a) x$ D) $(15+24 a) x$
Solution
Step 1 ：The expression $15x + 24ax$ can be simplified by factoring out the common factor $x$.
Step 2 ：So, we can rewrite the expression as $(15+24a)x$.
Step 3 ：The equivalent form of the expression $15x + 24ax$ is \(\boxed{(15+24a)x}\).
