Question

if X equals to 1 y equals to minus 2 and Z equals to 3 find the value of 1 -X ^ 3 + Y to the power 3 + Z ^ 3 - 3 x y z , 2- 3 x y to the power 4 - 15 x ^ 2 Y + 4z​

Answer 1

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Answer 2

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$x =1 , y=-2 , z=3$

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$(i) x^3 +y^3+z^3 -3xyz$

$⟹1^3 +(-2)^3+3^3 -3(1)(-2)(3)$

$⟹ 1 -8 +27 + 18$

$⟹1 -8 +27 + 18$

$⟹46-8$

$⟹38$

$(ii) 3xy^4-15x^2y +4z$

$⟹3(1)(-2)^4-15(1)^2(-2) +4(3)$

$⟹ 48+30 +12$

$⟹48+30 +12$

$⟹ 90$

Hope it will help you

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