Question

If a - b = 7 and ab = 8, evaluate (i) a2 + b2 and (ii) a + b.

Please help ​

Answer 1

Step-by-step explanation:

given, a-b=7.......(1)

ab=8........(2)

from (1), a= b+7

substituting in equation (2)

(b+7)(b)=8

b^2+7b-8=0

solve this quadratic equation we get,

b=1 or -8

let's take b=1

then, a=8

so, a^2+b^2=64+1=65

and a+b=8+1=9

hope it helps you

Answer 2

Step-by-step explanation:

see the attachment

hope it is helpful