Question

If a-b =5 and a^2-b^2=45,then the value of a+b is
options
7
8
9
10

Answer 1

Answer:

⇒(a+b)

2

=7

2

⇒a

2

+b

2

+2ab=49

⇒a

2

+b

2

=49−2(10)

⇒a

2

+b

2

=29

Now,

(a−b)

2

=a

2

+b

2

−2ab

=29−2(10)

=29−20

=9

∴a−b=

9

=±3

Answer 2

Answer:

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