If x - y = 2 and xy = 63, find the value of x + y
Answers
Answered by
2
Step-by-step explanation:
very easy
we know
=>(x – y)²= (x +y)²– 4xy
=>(2)²=(x + y)² – 4×63
=>4 = (x+y)²– 252
=>(x+y)²=252+4
=>(x+y)²=256
=>x+y=√256
=>x+y=√16×16
=>x+y=16
formula used
=>(a – b)²= (a + b)² – 4ab
Answered by
3
Answer:
(x+y)2=(x-y)2+4xy=(2)2+252=256
(x+y)2=256
x+y=√256=16
Step-by-step explanation:
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