1.

If a + b = 9, ab = 4, find the value of a + b.If a - b = 5, a + b2 = 49, find the value of ab.​

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Answer:

Q1.If a + B = 9AND ab = 4

Squaring both sides ,

( {a}^{} + {b}^{} ) {}^{2} = {9}^{2}

{a}^{2} + {b}^{2} + 2ab \: = 81

{a}^{2} + {b}^{2} + 8 \: = 81

{a}^{2} + {b}^{2} = 73

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