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When I am not using a scientific calculator the sum -2 x -2 + 3 comes up as -1 when I use a scientific calculator the answer is 7 why is this, thanks

Guest Mar 6, 2017
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The correct answer should be 7.

Multiplication comes before addition.

A negative times a negative is a positive.

-2 * -2 + 3

4 + 3 = 7

 

I don't know what the other calculator is doing. Maybe it's thinking the negative signs are subtraction signs and it completely ignores the multiplication.

-2 - 2 + 3

-4 + 3 = -1

hectictar  Mar 6, 2017

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