Question

Find the value of x² + y² + z² - xy - yz - zx when x = -3,y = 4 and z= -2.​

Answer 1

Answer:

x² + y² + z² - xy - yz - zx

(-3)²+(4)²+(-2)²-(-3)(4)-(4)(-2)-(-2)(-3)

9+16+4+12+8-6

43

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Answer 2

-3²+4²+(-2)²-(-3)(4)-(4)(-2)-(-2)(-3)

9+16+(4)-(-12)-(-8)-(6)

9+16+4+12+8-6

49-6

43

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