Question

if (a+b) =
5 and ab =2 fond the value of (a+b)²​

Answer 1

Give a+b = 5. , ab= 2

(a+b)^2 = 5^2

= 25

I think u want to ask a^2 +b^2

so.

$(a + b)^{2} = {a}^{2} + {b}^{2} + 2ab \\ \\ {5}^{2} = {a }^{2} + {b}^{2} + 2 \times 2 \\ \\ 25 = {a}^{2} + {b}^{2} + 4 \\ \\ {a}^{2} + b {}^{2} = 25 - 4 = 21$

Ans...