Question

if a +b =7 and a - b=3 then the value of ab is?​

Answer 1

a+b=7 ----------1)

a-b=3 ----------2)

Add eqn 1 and 2

so, a+b=7 + a-b=3

+b and -b will get reduced.

so, we get 2a= 10

so, a =5

Put the value of a=5 in eqn 1

so we get, 5+b=7

so, b=2

we have got the values of a and b

a² + b² = 5² + 2²

i.e, 25+4

=29

so, a²+b²=29

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Answer 2

Answer:

a=5 , b=2

Step-by-step explanation:

by using elimination method,

a+b=7 substitute a = 5 in first equn

5+b = 7

b= 7-5 b = 2

a-b=3

_____

2a = 10

a= 5