Question

please answer my question fast
if a+b=1 and a-b=7 find (given in pic above )

Answer 1

Hello mate!

a + b = 1 -----(1)
a - b = 7 ------(2)

Adding both equations , we get :-

2a = 8
a = 8/2 or 4

So b,

a + b = 1
4 + b = 1
b = 1 - 4 or - 3

$i) = {a}^{2} + {b}^{2} \\ {4}^{2} + {( - 3)}^{2} \\ 16 + 9 = 25 \\ \\ ii)ab = 4 \times ( - 3) \\ - 12$

Hope it helps☺!