Question

Verify that x-y is a rational number when

i. x= -3/7, y=-2/5​
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Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

MATHS

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Asked on December 26, 2019 by

Savneet Jaykumar

If x−y=3 and xy=10, find x

2

+y

2

.

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ANSWER

Given that: x−y=3 And xy = 10

Using the given identity: (a−b)

2

= a

2

−2ab+b

2

So, (x−y)

2

= x

2

−2xy+y

2

⇒ (x−y)

2

= x

2

−2(10)+y

2

⇒ (3)

2

= x

2

−20+y

2

⇒ 9 = x

2

+y

2

−20

⇒ 9+20 =x

2

+y

2

⇒ x

2

+y

2

= 29

The correct answer is x

2

+y

2

=29