Question

IF a+b= 7 and ab=4 then
a 2 + b 2​

Answer 1

Answer:

a² + b² = 41

Given:

a + b = 7

ab = 4

To find:

a² + b² = ?

Explanation:

a + b = 7

(a + b)² = 7²

a² + 2ab + b² = 49

a² + 2 × 4 + b² = 49

a² + 8 + b² = 49

a² + b² = 49 - 8

a² + b² = 41

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