Question

Calcule:

a) (3a² - 5b + 2a) + (5a² - 3b - 2a)

b) (3x² - 5x + 2) - (x² + 6x - 4)

c) (x³ + x²) - (x³ - 2xy - y²) + (x² + xy + 3y²)

d) (3a - b) - (5a - a) + (3a - b)

COM CÁLCULO, URGENTE



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Answer 1

Explicação:

a)

$3a {}^{2} - 5b + 2a + 5a {}^{2} - 3b - 2a = \\ 8a {}^{2} - 8b + 2a - 2a = \\ 2(4a {}^{2} - 4b + a - a) = \\ 2 \times 4(a {}^{2} - b) = \\ 8(a {}^{2} - b)$

b)

$3x {}^{2} - 5x + 2 - x {}^{2} - 6x + 4 = \\ 2x {}^{2} - 11x + 6$

c)

$x {}^{3} + x {}^{2} - x {}^{3} + 2xy + y {}^{2} + x {}^{2} + xy + 3y {}^{2} = \\ 2x {}^{2} + 3xy + 4y {}^{2}$

d)

$2(3a - b) - 5a + a = \\ 2(3a - b) - 4a = \\ 2(3a - b - 2a) = \\ 2(a - b)$