Solve the Equation: Finding the Missing Number in -25-?=100

Solve the following problem:

−25−?=100 -25-?=100

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find the unknown
00:08 Isolate the unknown
00:26 Reduce what's possible
00:39 Isolate the unknown
00:56 Calculate each operation separately
01:10 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 problem:

−25−?=100 -25-?=100

2

Step-by-step solution

We'll add ?+ to both sides to zero out the left side:

−25−?+?=100+? -25-?+?=100+?

−?+?=0 -?+?=0

Therefore, we obtain:

−25−0=100+? -25-0=100+\text{?}

−25=100+? -25=100+\text{?}

We'll add minus 100 to both sides to zero out the right side:

−25−100=100−100+? -25-100=100-100+\text{?}

We should obtain the following:

−125=0+? -125=0+\text{?}

−125=? -125=\text{?}

3

Final Answer

−125 -125

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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