Which of the following statement is correct? I. If x = 12, y = -2 and…

I. If x = 12, y = -2 and z = -10, then $x^3+y^3+z^3=720$

$x^3+y^3+z^3$ = 12³ + (-2)³ + (-10)³

$x^3+y^3+z^3$  = 1728 - 8 - 1000 = 720

II. If x + y = 48 and 4xy = 128, then s the value of $4x^2 +4y^2 is 8960$

$x^3+y^3$ = 4 ( x² + y² )  = 4 (x² + y² + 2xy)

xy  = \(\frac{128}{4}\) = 32

48² = (  x² + y² + 2 × 32 ) 

x² + y² = 2240

4 ( x2 + y2 ) = 4 × 2240 = 8960

Both I and II