Question

If x=7 and y=−3, evaluate the following expression:3x−y2​

Answer 1

27

Explanation:

3x−y2​= ? if x= 7 & y= -3

Step 1 insert the numbers where they go:

3(7)-(-3)2=

Step 2 the two negatives become a positive:

3(7)+(3)2=

Step 3 multiply:

21+6=

Step 4 add:

27

Answer 2

3(7)-(3)2 sub in the numbers
21-6=15
the answer is 15