Question

6. If a = 1, b = -1, c = 1, x = -2, y = 2 and z = -2, then, evaluate: ax2 + by2 + cz2
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Answer 1

$(1)( - 2)2 + ( - 1)(2)2 + (1)( - 2) = \\ \\ - 4 - 4 - 2 = - 10$

Answer 2

Answer:

ax^2 + by^2 + cz^2

1(-2)^2 + (-1)(2)^2 + 1(-2)^2

4-4+4=4

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