Question

check whether the solution, x = 3, is correct by using substitution. start by substituting 3 for x in the original equation. the parentheses are included to show multiplication. 5(x + 2) = 2x + 19 5(□ + 2) = 2(□) + 19

Explanation:

Step1: Substitute x=3 in left term

We substitute \( x = 3 \) into \( 5(x + 2) \), so the left box (where \( x \) is) should be 3. So we get \( 5(3 + 2) \).

Step2: Substitute x=3 in right term

We substitute \( x = 3 \) into \( 2x + 19 \), so the right box (where \( x \) is) should be 3. So we get \( 2(3)+ 19 \).

Answer:

Both boxes should be filled with 3. So the first box (in \( 5(\square + 2) \)) is 3 and the second box (in \( 2(\square)+ 19 \)) is 3.