Question

a) 3x ao quadrado + 5x = 0? b) 4x ao quadrado - 12x = 0? c ) 5x ao quadrado + X = 0? d) 2x ao quadrado = 7x? me ajudem a...
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Answer 1

A) 3x² + 5x = 0
x(3x + 5) = 0

x = 0
3x + 5 =0
x = -5/3

b) 4x² - 12x = 0
x(4x - 12) = 0

x = 0
4x - 12 = 0
4x = 12
x = 12/4
x = 3

c ) 5x² + X = 0
x(5x + 1) = 0

x = 0
5x + 1 = 0
5x = -1
x = -1/5

d) 2x² = 7x
2x² - 7x = 0
x (2x - 7) = 0

x = 0
2x - 7 = 0
x = 7/2