Question

Questão 05- Calcule:
a) 7X. (2x-5) =
b) (3x-4). (10+2x) =
c) (3a-2a - 1).5 =
d) (5x-10). ( 5x+10) =
e) -3x. (4x2 – 3x + 1) =


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Answer 1

Resposta:

a) 7X . (2x - 5) =

14x² - 35x

b) (3x - 4) . (10 + 2x)  =

30x + 6x² - 40 - 8x

6x² + 22x - 40

c) (3a - 2a - 1) . 5 =

(1a - 1) . 5

5a - 5

d) (5x - 10) . ( 5x + 10) =

25x² - 25x - 50x - 100

25x² - 75x - 100

e) - 3x . (4x² - 3 x + 1) =

- 12x³ + 9x² - 3x