Question

if x+ y = 3 , xy = 2 then what is the value of x3-y3__!!​

Answer 1

Answer:

x+y = 3

xy = 2

We need to find the value of y

Using equation (II)

Put the value of x in equation (I)

So, the value of y will be

We need to find the value of  

Using given equation

Put the value of x

Put the value of y = 1

Put the value of y = 2

Hence, The value of  is 7 and -1.

Step-by-step explanation:

Answer 2

Answer:

⇒ (X – Y)2 = (X + Y)2 – 4XY

⇒ (X – Y)2 = 32 – 4 × 2

⇒ (X – Y)2 = 1

⇒ X – Y = 1

∴ X3 – Y3

⇒ (X – Y) (X2 + XY + Y2)

⇒ 1 × [(X + Y)2 – XY]

⇒ (32 – 2)

⇒ 7