Question

9. If a - b = 4 and a + b = 6; find :
(1) a² +b^2
(ii) ab​

Answer 1

Step-by-step explanation:

a-b = 4________(i)

a+b =6________(ii)

From equation (i) and (ii)

a-b+a+b=10

2a=10

$\tt \: a = \frac{10}{2} = 5$

and b= 1

After find the value of a=5 and b=1 ,

$\tt(1) \: \: \: {a}^{2} + {b}^{2} \\ \\ \tt = {5}^{2} + {1}^{2} \\ \\ \tt = 25 + 1 = 26$

AND

(2). ab

5×1=5