if x-y=6 and xy=24 find x+y
Answers
Answered by
15
Step-by-step explanation:
X - y = 6
xy = 24
X + y = ?
x+ y = ?
According to the formula of x² + y²
= ( x - y ) ² + 2xy
= ( 6)² + 2 × 24
= 36 + 48
= 84 Answer
Than,
( x² + y²) = (x + y ) ² - 2xy
84 = ( x + y) ² - 2x 24
84 = ( x + y )² - 48
84+48 = ( x + y ) ²
132 = ( x + y ) ²
by doing root under both side,
√132 = √(x + y)²
11.48 = ( x + y )
Therefore,
x + y = 11.48 Final answer
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Answered by
0
Answer:
x-y=6
x=6+y
xy=24
(6+y) y=24
______________________
we know the algebraic identity:
(x+y)² = (x-y)²+2xy
______________________
(x+y)²
= (x-y)²+2xy
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