Solve Expression a·b+1 When a=2 and b=-2: Step-by-Step

a⋅b+1= a\cdot b+1=

Replace and calculate if a=2,b=−2 a=2,b=-2

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Place and calculate
00:04 Let's substitute appropriate values according to the given data, being careful with parentheses
00:19 Positive times negative is always negative
00:23 Let's continue solving according to the correct order of operations
00:27 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

a⋅b+1= a\cdot b+1=

Replace and calculate if a=2,b=−2 a=2,b=-2

2

Step-by-step solution

Let's begin by inserting the given data into the formula:

2×(−2)+1= 2\times(-2)+1=

Remembering the rule:

(+x)×(−x)=−x (+x)\times(-x)=-x

Let's now solve the multiplication operation:

2×(−2)=−4 2\times(-2)=-4

In order to obtain the following expression:

−4+1= -4+1=

Therefore, the answer is:

−3 -3

3

Final Answer

−3 -3

Practice Quiz

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Solve the following exercise:

\( (+5)\cdot(+5)= \)

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