Question

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

Answer 1

$\huge\underline\bold\red{AnswEr}$

a+b=9

Squaring both the sides

=>a²+b²+2ab=81

Substituting value of 'ab' in equation

=>a²+b²+2*4=81

=>a²+b²=73

Answer 2

$\huge\bold{\purple{\fbox {\pink{\mathbb{ANSWER}}}}}$

a+b=9

Squaring both the sides

=>a²+b²+2ab=81

Substituting value of 'ab' in equation

=>a²+b²+2*4=81

=>a²+b²=73

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