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=ab=(7)(2)=5 x=c d=(9) (5)=45a=-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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