Question

What is the value of x²-y² if (x+y) = 9, (x - y) = 4?

Answer 1

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Answer 2

Answer:

x²-y²=36

Step-by-step explanation:

1) Given x+y= 9

x-y=4

2) we know that (a+b)*(a-b)= a²-b²

there fore:   x²-y²=   (x+y)  *  (x-y)

                            =    9 x 4

                            =    36.