Question

resolva:

a) 2x²+11=x²+12
b) 5(x²-1)=4(x²+1)
c) x(x+2)=2x+25

Answer 1

a) x² = 1
b) x² = 9
c) x² = 25

O que me leva a pensar que na letra a) x = 1, na letra b) x = 3 e na letra c) x = 5

Answer 2

a)
2x² + 11 = x² + 12
2x² - x² = 12 - 11
x² = 1
x = √1

R.: x = + 1 e x = - 1

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b)

5.(x² - 1) = 4.(x² + 1)
5x² - 5 = 4x² + 4
5x² - 4x² = 4 + 5
x² = 9
x = √9
x = + 3 e x = - 3

¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
c)
x.(x + 2) = 2x + 25
x² + 2x = 2x + 25
x² + 2x - 2x = 25
x² = 25
x = √25
x = + 5 e x = - 5 

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