dhelaidz dhelaidz

06-12-2020
Mathematics

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If (a-b)²=7 and (a²+b²) =29.what is ab? Plssss asap

Respuesta :

tomjeery22505 tomjeery22505

06-12-2020

Answer:

Given - (a-b)²=7

(a²+b²) =29

To find - ab

Solution -

( a- b) ^2 = 7

(a^2 + b^2) = 29

Expanding the bracket by using identity

a^2 + b^2 -2ab = 7

29 - 2ab = 7 (given a^2 + b^2 = 29 )

-2ab = 7 -29

-2ab = (-22)

ab = (-22) /(-2)

ab = 11

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