Question

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Answer 1

a) x² - 5x + 8, x = 2

2² - 5 × 2 + 8

4 - 10 + 8

4 - 18

-14

b) x² - 5x + 8, x = -2

-2² - 5 (-2) + 8

-4 + 10 + 8

-4 + 18

14

c) x² + 2xy, x = - 4; y = 0

-4² + 2 (-4) × 0

-16

d) x² + 2xy, x = -2; y = 3

-2² + 2 (-2) × 3

-4 - 4 × 3

-4 - 12

-16