Solve -a·b: Calculate the Product When a=-3 and b=5

−a⋅b= -a\cdot b=

Replace and calculate if a=−3, b=5 a=-3\text{, }b=5

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Set up and calculate
00:05 Let's substitute appropriate values according to the given data, being careful with parentheses
00:21 Negative times negative is always positive
00:26 Let's calculate the multiplication
00:29 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= -a\cdot b=

Replace and calculate if a=−3, b=5 a=-3\text{, }b=5

2

Step-by-step solution

First, we replace the data in the exercise

-(-3)*5 = 

To better understand the minus sign multiplied at the beginning, we will write it like this:

-1*-3*5 = 

Now we see that we have an exercise that is all multiplication,

We will solve according to the order of arithmetic operations, from left to right:

-1*-3 = 3

3*5 = 15

3

Final Answer

15 15

Practice Quiz

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Solve the following exercise:

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

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