Solve the Equation: (-5)·(?4)=20 - Determining the Missing Sign

Fill in the corresponding sign for the following question

(−5)⋅(?4)=20 (-5)\cdot(?4)=20

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Complete the appropriate sign
00:04 The solution is positive, so we want a sign that leads to a positive result
00:09 Negative times negative always equals positive
00:14 Therefore the appropriate sign is negative
00:18 And this is the solution to the question

Step-by-step written solution

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1

Understand the problem

Fill in the corresponding sign for the following question

(−5)⋅(?4)=20 (-5)\cdot(?4)=20

2

Step-by-step solution

We must first consider what value we need to multiply by a negative number in order to obtain a positive number.

Let's remember the rule:

(−x)×(−x)=+x (-x)\times(-x)=+x

Therefore, the answer is:

−4 -4

3

Final Answer

(−) (-)

Practice Quiz

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What will be the sign of the result of the next exercise?

\( (-2)\cdot(-4)= \)

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