Question

. If a-b=7 and ab -8 evaluate
(1) a2+b2​

Answer 1

Answer:

$( {a - b)}^{2} = {a}^{2} + {b}^{2} - 2ab \\ {7}^{2} = {a}^{2} + {b}^{2} - 2 \times 8 \\ 49 = {a}^{2} + {b}^{2} - 2 \times 8 \\ 49 + 16 = {a}^{2} + {b}^{2} \\ {a}^{2} + {b}^{2} = 65$