x-y=5,xy=84,find x and y
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the value of x is ( -7 or 12) ans y is (-12 or 7)
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3
x-y=5
xy=84
x=5+y
sub x value in xy=84
(5+y)y=84
y2+5y=84
y2+5y-84=0
y=-12 and 7
sub y=-12 in x-y=5
x+12=5
x=5-12=-7
sub y=7 in x-y=5
x-7=5
x=5+7=12
so,
x=-7,12
y=-12,7
xy=84
x=5+y
sub x value in xy=84
(5+y)y=84
y2+5y=84
y2+5y-84=0
y=-12 and 7
sub y=-12 in x-y=5
x+12=5
x=5-12=-7
sub y=7 in x-y=5
x-7=5
x=5+7=12
so,
x=-7,12
y=-12,7
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