Question

if a-b=3,ab=2,then find a2+b2​

Answer 1

Answer:

( a-b) 2=a2+b2 +2ab

(3)2=a2+b2+2*2

9=a2+b2+4

a2+b2=9-4

a2+b2= 5

Answer 2

Step-by-step explanation:

$by \: using \: identity - \\ (a - \: b) { }^{2} = \: a { }^{2} + \: {b}^{2} - \: 2ab \\ {3 }^{2} = {a}^{2} \: + {b}^{2} - 2(2) \\ 9 \: + 4 = \: {a}^{2} + {b}^{2} \\ 13 \: = \: {a}^{2} \: + \: {b}^{2}$