Question

What must be subtracted from -2 to get -7

Answer 1

Step-by-step explanation:

Let the number be -x

According to the Question

-2 -x = -7

-x= -7+2

-x= -5

x=5

Number is 5,

Hope it helps

Answer 2

Concept

A positive sign will be included in the outcome when two positive integers are added.

e.g. $2+3=5$

The outcome will bear the sign of the larger number when two numbers with opposite signs—one positive and the other negative—are added or subtracted.

e.g. $2-4=-2$

The outcome will bear the sign of the larger number when two numbers with opposite signs—one negative and the other positive—are added or subtracted.

e.g. $-5+3=-2$

When subtracting two negative numbers, the outcome will also be negative.

$-1-3=-4$

Given

The given number is $-2$.

Find

We have to find the integer which must be deducted from $-2$ to obtain $-7$.

Solution

Consider $x$ be the integer to be subtracted with $-2$ in order to obtain the resulting integer $-7$, then

$-2-x=-7\\x=-2+7$

Now, using the following convention that the outcome will bear the sign of the larger number when two numbers with opposite signs—one positive and the other negative—are added or subtracted, we get

$x=5$

Hence, $5$ is the required number which must be deducted from $-2$ to obtain $-7$.

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