Question

x+y=√3 এবং x-y=√2হলে,
x square + y square =?

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Answer 1

Answer:

2.5

Step-by-step explanation:

x+y=√3 and x-y=√2

if we square them both side of the two equeation

then,

( x+y) ^2= (√3) ^2 & (x-y) ^2=(√2) ^2

or, x^2+2xy+y^2= 3 & x^2-2xy+y^2= 2

adding this two equation,

we got

x^2+2xy+y^2= 3

x^2-2xy +y^2= 2

by addition,

2x^2 +2y^2 = 5

2(x^2 +y^2)= 5

x^2+y^2= 2.5