Question

2)Desenvolva as operações:
a) (x +3).(x - 7) =
b) (x2 + 2x - 5)+ (2x2 - 5x + 1)=
c) (x + 4)2 =
d) (3x - 7).(3x + 7) =
e) (2x + 1).(x+2) =​

Answer 1

Explicação passo-a-passo:

• a) (x + 3).(x - 7)

x.x + x.(-7) + 3.x + 3.(-7)

x² - 7x + 3x - 21

x² - 4x - 21

• b) (x² + 2x - 5) + (2x² - 5x + 1)

x² + 2x - 5 + 2x² - 5x + 1

3x² - 3x - 4

• c) (x + 4)²

(x + 4)(x + 4)

x.x + x.4 + 4.x + 4.4

x² + 4x + 4x + 16

x² + 8x + 16

• d) (3x - 7).(3x + 7)

3x.3x + 3x.7 + (-7).3x + (-7).7

9x² + 21x - 21x - 49

9x² - 49

• e) (2x + 1).(x + 2)

2x.x + 2x.2 + 1.x + 1.2

2x² + 4x + x + 2

2x² + 5x + 2