Question

Resolva os seguintes cálculos algébricos

A) (3x²-11x) + (-7x²+12x+9)

B) (5x²-2x+3) - (3x²- 7x+5)

C) (- 30x² - x + 3) - (4x²+2x+1)

Answer 1

Olá!
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Resolução,

A)

$\mathsf{(3x^2 - 11x) + (-7x^2 + 12x + 9)}$

$\boxed{\mathsf{= - 4x^2 + x + 9}}$


B)

$\mathsf{(5x^2 - 2x + 3) - (3x^2 - 7x + 5)}$

$\mathsf{5x^2 - 2x + 3 - 3x^2 + 7x - 5}$

$\boxed{\mathsf{= 2x^2 + 5x - 2}}$


C)

$\mathsf{(-30x^2 - x + 3) - (4x^2 + 2x + 1)}$

$\mathsf{- 30x^2 - x + 3 - 4x^2 - 2x - 1}$

$\boxed{\mathsf{= - 34x^2 - 3x + 2}}$

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Abraços!

Answer 2

Boa tarde Yasmine

A) (3x² - 11x) + (-7x² + 12x + 9)

3x² - 7x² - 11x + 12x + 9 = -4x² + x + 9

B) (5x² -2x + 3) - (3x² - 7x + 5)

5x² - 3x² - 2x + 7x  + 3 - 5 = 2x² + 5x - 2

C) (- 30x² - x + 3) - (4x² + 2x + 1)

-30x² - 4x² - x - 2x + 3 - 1 = -34x² - 3x + 2