Maths.Algebraic expressions.Plz help me out with this sum urgently

Maths.Algebraic expressions.Plz help me out with this sum urgently h —J •q h + x •e 40 amen pug Rx pue = (Eh +

Dear student,
a) We have,x2+y2=74adding 2xy to both sidesx2+y2+2xy=74+2xyx+y2=74+2xy    --[using identity a+b2=a2+b2+2ab]x+y2=74+2×35      --[using given values xy=35]x+y2=74+70x+y2=144x+y=144x+y=±12b) x2+y2=74subtracting 2xy to both sidesx2+y2-2xy=74-2xyx-y2=74-2xy    --[using identity a-b2=a2+b2-2ab]x-y2=74-2×35      --[using given values xy=35]x-y2=74-70x-y2=4x-y=±2
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