Question

If a + b = 3 and a2 + b2 = 5 then ab is​

Answer 1

Answer:

ab=2

Step-by-step explanation:

Given- a+b=3

, $a^{2} +b ^{2} =5 \\A.T.Q\\Squaring both sides\\(a+b)^{2} =3^{2} \\Using (a+b)^{2} = a^{2} +b^{2} +2ab \\a^{2} +b^{2} +2ab =9\\5+2ab=9\\2ab=9-5\\2ab=4\\ab=\frac{4}{2} \\ab=2$