Question

Porr Favoor Minn Ajudemm


1
a) $\frac{4x²}{3}$ + 5x = 0
b) $\frac{7(x+2²}{2}$ = 14

Answer 1

a)

4x²   +   5x = 0
------
   3

4x² + 15x =   0
-------------   ------
     3              3

x.(4x + 15) = 0
x = 0

4x + 15 = 0
4x = - 15
x = - 15/4

R.: x = 0 e x = - 15/4

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b)

7.(x + 2)²
--------------  =  14
        2

7(x² + 2.2x + 4) = 2.14
7.(x² + 4x + 4) = 28
x² + 4x + 4 = 28/7
x² + 4x + 4 = 4
x² + 4x = 4 - 4
x² + 4x = 0
x.(x + 4) = 0
x = 0

x + 4 = 0
x = - 4

R.: x = 0 e x = - 4
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