Pregunta: EXERCISES 7.3 Find all points (x, y) where f(x, y) has a possible relative maximum or minimum. 1. f(x, y) = x2 – 3y2 + 4x + 6y + 8 2. f(x, y) = 3x2 + y2 – 3x + 2y – 5 3. f(x, y) = x2 - 5xy + 6y2 + 3x – 2y + 4 4. f(x, y) = -3x2 + 7xy – 4y2 + x + y 5. f(x, y) = 3x2 + 8xy – 3y2 – 2x + 4y - 1 6. f(x, y) = 4x2 + 4xy – 3y2 + 4y - 1 7. f(x, y) = x3 + y2 – 3x + 6y

EXERCISES 7.3 Find all points (x, y) where f(x, y) has a possible relative maximum or minimum. 1. f(x, y) = x2 – 3y2 + 4x + 6y + 8 2. f(x, y) = 3x2 + y2 – 3x + 2y – 5 3. f(x, y) = x2 - 5xy + 6y2 + 3x – 2y + 4 4. f(x, y) = -3x2 + 7xy – 4y2 + x + y 5. f(x, y) = 3x2 + 8xy – 3y2 – 2x + 4y - 1 6. f(x, y) = 4x2 + 4xy – 3y2 + 4y - 1 7. f(x, y) = x3 + y2 – 3x + 6y 8. f(x, y) = x2 - y2 + 5x + 12y +1 9. f(x, y) = -8y3 + 4xy +9y2 – 2y 90. f(x, y) = -8y3 + 4xy + 4x2 +9y2 11. f(x, y) = 2x3 + 2x²y - y2 + y 12. f(x, y) = * x2 + 6xy – 3y2 + 3x + 6y 13. f(x, y) = 3x3 – 2y3 – 5x + 6y - 5