Question

Simplify the following algebraic expression and then find the value: 3x² - y² - z² - x² + 2y² + 4z², when x = 1, y = -2 and z = 2.​

Answer 1

see attached file for the answer

Answer 2

Step-by-step explanation:

=3x² − y² − z² − x² + 2y² + 4z²

3(1)² - (-2)² - (-2²) - 1² + 2(-2)² + 4(2)²

(3-(-4)-4-1) + (8+16)

-6+24

18

HENCE THE ANSWER IS 18

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