Product of the sum and difference

Calculate the product of the sum and difference of numbers -7 and -2.

Correct result:

x =  45

Solution:

$a=-7 \ \\ b=-2 \ \\ c=a+b=(-7)+(-2)=-9 \ \\ d=a-b=(-7)-(-2)=-5 \ \\ x=c \cdot \ d=(-9) \cdot \ (-5)=45$

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