Question

(ü) If x = 5, y = 7 and z = 15, find the value of x³ + y³ + z³ - 3xyz/
xy + yz + zx – x²– y²-z²​

Answer 1

given x = 5, y=7 and z=15

now put the given values in the given equation

=(5)³+(7)³+(15)³ - 3(5x7x15)   /   5x7+7x15+15x5- (5²)-(7²)-(15²)

=125+343+3375-1575   /   35 +  105+ 75 - 25 - 49 - 225

=2268  /   -54

= - 42 ( negative 42)

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