(x+y)=9 and xy=14,find x*x-y*y.
Answers
Answered by
3
x+y=9
7+2=9
xy=14
7×2=14
(x*x)-(y*y)=?
substitute the numbers which you used for the above questions
(7×7)-(2×2)
49-4
45 is the answer.
I hope this answer is correct.....
7+2=9
xy=14
7×2=14
(x*x)-(y*y)=?
substitute the numbers which you used for the above questions
(7×7)-(2×2)
49-4
45 is the answer.
I hope this answer is correct.....
Akhilesh2329:
It will really help me. Thank you so much.
your welcome
Answered by
2
x+y=9
y=9-x
xy=14
x(9-x)=14
9x-x^2=14
-x^2+9x-14=0
x^2-9x+14=0
x^2-7x-2x+14=0
x(x-7)-2(x-7)=0
(x-2)(x-7)=0
x=2,7
y=9-x
=9-7=2(x=7)
x*x-y*y=7×7-2×2=49-4=45. answer
y=9-x
xy=14
x(9-x)=14
9x-x^2=14
-x^2+9x-14=0
x^2-9x+14=0
x^2-7x-2x+14=0
x(x-7)-2(x-7)=0
(x-2)(x-7)=0
x=2,7
y=9-x
=9-7=2(x=7)
x*x-y*y=7×7-2×2=49-4=45. answer
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