If x + y = 25 and xy = 100, find the value of x - y.
Answers
Answered by
3
Step-by-step explanation:
(x+y)^2 = x^2+y^2+2xy =25^2
=x^2+y^2+2×100=625
x^2+y^2 = 425
(x-y)^2 = x^2+y^2-2xy
=425-200
=225
x-y = +/-15
Similar questions