Question

9. Evaluate the following at x=-1, y = -2. z = 0 : (ii) (x + y)² – (y + z)²– (x + z)² – 3 xyz


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explain​

Answer 1

Answer:

Answer is 4

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Answer 2

Step-by-step explanation:

x=-1, y = -2. z = 0

${(x + y)}^{2} - {(y + z)}^{2} - {(x + z)}^{2} - 3xyz \\ = {( (- 1) + ( - 2))}^{2} - {( - 2 + 0)}^{2} - {( - 1 + 0)}^{2} - 3( - 1)( - 2)(0) \\ = {( - 1 - 2)}^{2} - {( - 2)}^{2} - {( - 1)}^{2} - 0 \\ = {( - 3)}^{2} - {( - 2)}^{2} - {( - 1)}^{2} \\ = 9 - 4 - 1 \\ = 9 - 5 \\ = 4$

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