x²-y² if (x-y)=1 and (x+y)=7
Answers
Answered by
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 !
Answered by
1
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
Please mark as brainliest answer
x+y = 7
Solving the two simultaneous equations,
We get x=4 and y=3
Therefore x^2-y^2 = 16-9 = 7
Please mark as brainliest answer
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