Question

2) Efetue as seguintes subtrações:

a) (5x^ 2 -4x+7)-(3x^ 2+7x-1)

b) (6x ^ 2 - 6x + 9) - (3x ^ 2 + 8x - 2)

c) (7x - 4y + 2) - (2x - 2y + 5)

d) (4x - y - 1) - (9x + y + 3)

e) (- 2a ^ 2 - 3 ^ a + 6) - (- 4a ^ 2 - 5 ^ a + 6)

f) (4x^ 3 -6x^ 2 +3x)-(7x^ 3 -6x^ 2+8x)

g) (x ^ 2 - 5x + 3) - (4x ^ 2 + 6)

h) (x ^ 2 + 2xy + y ^ 2) - (y ^ 2 + x ^ 2 + 2xy);

i)(7ab+4c-3a)-(5c+4a-10) ​

Answer 1

Resposta:

Explicação passo a passo:

Efetue as seguintes subtrações:

a) (5x^2 - 4x+7) - (3x^2+7x-1)

= 5x^2 - 4x + 7 - 3x^2 - 7x + 1

= 5x^2 - 3x^2 - 4x - 7x + 7 + 1

= 2x^2 - 11x + 8

_______________

b) (6x^2 - 6x + 9) - (3x^2 + 8x - 2)

= 6x^2 - 3x^2 - 6x - 8x + 9 + 2

= 3x^2 - 14x + 11

_______________

c) (7x - 4y + 2) - (2x - 2y + 5)

= 7x - 4y + 2 - 2x + 2y - 5

= 7x - 2x - 4y + 2y + 2 - 5

= 5x - 2y - 3

____________

d) (4x - y - 1) - (9x + y + 3)

= 4x - 9x - y - y - 1 - 3

- 5x - 2y - 4

_____________

e) (- 2a^2 - 3^a + 6) - (- 4a^ 2 - 5^a + 6)

= - 2a^2 - 3^a + 6 + 4a^2 + 5^a - 6

= 2a^2 + 2^a

______________

f) (4x^3 - 6x^2 +3x)-(7x^3 - 6x^2+8x)

= 4x^3 - 7x^3 - 6x^2 + 6x^2 + 3x - 8x

= - 3x^3 - 5x

_____________

g) (x^2 - 5x + 3) - (4x^2 + 6)

= x^2 - 5x + 3 - 4x^2 - 6

= x^2 - 4x^2 - 5x - 3

= - 3x^2 - 5x - 3

______________

h) (x^2 + 2xy + y^2) - (y^2 + x^2 + 2xy)

= x^2 + 2xy + y^2 - y^2 - x^2 - 2xy

= x^2 - x^2 + 2xy - 2xy + y^2 - y^2

= 0

_________

i)(7ab+4c-3a)-(5c+4a-10) ​

= 7ab + 4c - 3a - 5c - 4a + 10

= 7ab + 4c - 5c - 3a - 4a+ 10

= 7ab - c - 7a + 10

________________