Question

Escreva as equacoes do 2 grau na forma reduzida
A- 3x²+3x=9
B- x (x - 7) +6=10+2x
C- 2x-4x²=5+2x
D- 3x. (4 - x) +2=10

Answer 1

a)
 3x² + 3x = 9 

3x² + 3x - 9 = 0  (:3)

x² + x - 3 = 0
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B)

x.(x - 7) + 6 = 10 + 2x
x² - 7x + 6 = 10 + 2x
x² - 7x - 2x + 6 - 10 = 0
x² - 9x - 4 = 0

¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
C)
2x - 4x² = 5 + 2x

2x - 2x - 4x² - 5 = 0

- 4x² - 5 = 0

¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨

D)
3x. (4 - x) + 2 = 10

12x - 3x² + 2 - 10 = 0

12x - 3x² - 8 = 0

- 3x² + 12x - 8 = 0
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