Question

x – y = 3, xy = 28 হলে (x2+y2)-এর মান হিসাব করে লিখি​

Answer 1

Step-by-step explanation:

xy=28

y=28/x

x-y=3

x-(28/x)=3

x²-28/x=3

x²-28=3x

x²-3x-28=0

x²-7x+4x-28=0

x(x-7)+4(x-7)=0

(x+4)(x-7)=0

x= -4 or 7

y=28/x

if x= -4 then y= -7

if x=7 then y=4

x²+y²

if x=-4 and y= -7

then (-4)²+(-7)²

=16+49=65

if x=7 and y=4

then x²+y² is also 65

x²+y²=65