if x+y=5 and x-y=3 find xy
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Answered by
3
x+y=5____(1)
x-y=3___(2)
equating (1)and (2)
2x=8
x=8/2
x=4
putting the value of x=4 in equation 1/equation 2
equation (1)
x+y=5
4+y=5
y=5-4
y=1
then,
xy=4×1
xy=4
x-y=3___(2)
equating (1)and (2)
2x=8
x=8/2
x=4
putting the value of x=4 in equation 1/equation 2
equation (1)
x+y=5
4+y=5
y=5-4
y=1
then,
xy=4×1
xy=4
lifelover:
can you give me ans by using identity
Answered by
3
by formula-
(a-b)^2=(a+b)^2-4xy
3^2=5^2-4xy
25-9=4xy
by solving,
xy=4
(a-b)^2=(a+b)^2-4xy
3^2=5^2-4xy
25-9=4xy
by solving,
xy=4
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