Question

Chen evaluated -3-(-5)+(7). His work is:

-3-(-5)+(7)
-3-(+2)
-3+(-2)
-5
What mistake did Chen make? Show how to find the correct value of the expression.

Answer 1

Chen made a mistake when subtracting -3 - (-5).

The correct value of the expression is 9.

Step-by-step explanation:

The correct way to subtract a negative number is to change the sign of the negative number and then perform addition.

So, -3 - (-5) becomes -3 + 5, which equals 2.

The rest of Chen's steps are correct, so the correct value of the expression is 2 + 7, which equals 9.