Question

Calcule as equações a seguir:
A) x2=144
B) 20x2=180

Answer 1

A)
x² = 144
x = √144
x = 12 e x = - 12

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B)
20x² = 180
x² = 180/20
x² = 9
x = √9
x = 3 e x = - 3