Solve the Equation: Finding the Number That Minus (-12) Equals -40

Solve the following expression:

?−(−12)=−40 \text{?}-(-12)=-40

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find the unknown
00:03 Negative times negative always equals positive
00:07 Open parentheses
00:14 Isolate the unknown
00:32 Calculate each operation separately
00:47 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Solve the following expression:

?−(−12)=−40 \text{?}-(-12)=-40

2

Step-by-step solution

Note the following rule:

−(−x)=+ -(-x)=+

We must rewrite the exercise in the appropriate form:

?+12=−40 ?+12=-40

Next, we will add -12 to both sides to cancel out the left side:

?+12−12=−40−12 ?+12-12=-40-12

This leaves us with:

?+0=−52 ?+0=-52

?=−52 ?=-52

3

Final Answer

−52 -52

Practice Quiz

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a is negative number.

b is negative number.

What is the sum of a+b?

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