Question

3 (x² - y²) -10 (x-y) - (x-y) quando x= -2

Answer 1

3 (x² - y²) -10 (x-y) - (x-y)

3 (4 - y²) -10 (-2-y) - (-2-y)
12 - 3y² + 20 + 10y + 2 + y
- 3y² +11y + 34 = 0 (-1)
3y² - 11y - 34 = 0

11 +- √121 - 4(3)(-34)
y= 17/3 e -2