Question

If a square + b square is equal to 74 and a b is equal to 35 then find a + b

Answer 1

False
I don't know whether its correct or wrong

Answer 2

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solution :
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given , ab = 35

a^2 + b^2 = 74

a^2 + b^2 + 2a b - 2a b = 74

( a + b )^2 - 2 a b = 74 _________eq.(1)

now put value of ' ab ' here in eq. (1), we get

( a + b )^2 - 2 ( 35 ) = 74

( a + b )^2 - 70 = 74

( a + b )^2 = 74 + 70

( a + b )^2 = 144

a + b = √144

a + b = 12

therefore value of ( a + b ) = 12

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Your Answer : a + b = 12
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