Question

Foster’s answer to the question he wrote for Ranger was 7x + (–3), while Ranger’s answer was 7x – 3. They both checked their work by letting x = 5, and they both claim to be correct. Are they both correct? Explain.

Answer 1

 Both Foster and Ranger are correct because subtracting 3 is the same as adding –3. If you let x = 5 in either of the expressions, you get the answer 32.

Answer 2

Answer:

Yes, they are both correct.

Step-by-step explanation:

Subtracting is the same as adding a negative number.

Ranger's answer was 7x-3; this is the same as 7x+(-3).  This means they are both correct.