Question

Efectue!

A) (a³+2a-1) + (-3a+2)

B) (-x³+3x²+x) -3(x³+2x²)

C) (a⁴+2ab+3b²) - (2a⁴+5ab-7b²)

Answer 1

A) (a³+2a-1) + (-3a+2)

a ³+ 2a - 1 - 3a + 2

a ³ +2a - 3a -1 + 2

a ³ - a + 1



B) (-x³+3x²+x) -3(x³+2x²)

- x ³ + 3a² + x -3x³ - 6x²

- 4x³ - 3a² + x



C) (a⁴+2ab+3b²) - (2a⁴+5ab-7b²)

a⁴ + 2ab + 3b² - 2a⁴ - 5ab + 7b ²

- a⁴ - 3ab + 10b ²

Answer 2

A)
= (a³+2a-1) + (-3a+2)
= a^3 + 2a - 1 - 3a + 2

= a^3 + 2a - 3a - 1 + 2
= a^3 - a + 1

B)
= (-x³+3x²+x) -3(x³+2x²)
= -x^3 + 3x^2 + x - 3x^3 - 6x^2

= - x^3 - 3x^3 + 3x^2 - 6x^2 + x
= - 4x^3 - 3x^2 + x

C)
= (a⁴+2ab+3b²) - (2a⁴+5ab-7b²)
= a^4 + 2ab + 3b^2 - 2a^4 - 5ab + 7b^2

= a^4 - 2a^4 + 2ab - 5ab + 3b^2 + 7 b^2
= - a^4 - 3ab + 10b^2