Question

01) Desenvolva

a) (3a - 2b)²
b) (5a + 7).(5a - 7)
c) (3x² + y³)²
d) (-5 -2y)²

Answer 1

(3a - 2b)² = (3a - 2b) * (3a - 2b) = 9a² - 6ab -6ab + 4b² = 9a² - 12ab + 4b²

(5a + 7).(5a - 7) = 5a² - 35a + 35a - 49 = 5a² - 49

(3x² + y³)² = (3x² + y³) * (3x² + y³) = (3x²)² + 3x²y³ + 3x²y³ + (y³)² = $9x^{4} + 6x^2y^3 + y^6$

(-5 -2y)² = (-5 -2y) * (-5 -2y) = (-5)² +10y + 0y + (-2y)² = 25 + 20y + 4y²