Question

x²-y² if (x-y)=1 and (x+y)=7​

Answer 1

Answer:

67.

Step-by-step explanation:

(x-y) = 7

Squaring both sides,

(x-y)^2 = 49

x^2 + y^2 - 2xy = 49

x^2 + y^2 = 49 + 2xy = 49+2*9 = 49+18 = 67.

I hope it helps !

Answer 2

x-y = 1

x+y = 7

Solving the two simultaneous equations,
We get x=4 and y=3

Therefore x^2-y^2 = 16-9 = 7

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