Question

Resolva as equações:

Answer 1

a) x² = 31+90
x² = 121
√x² = √121
x = ±11

b) 5x² = 49-4
5x² = 45
x² = 45/5
x² = 9
√x² = √9
x = ±3

c) 4x² - x² = 27
3x² = 27
x² = 27/3
x² = 9
x = ±3

d) 2x² - x² = 12 - 11
x² = 1
√x² = √1
x = ±1

e) 5x² - 5 = 4x² + 4
5x² - 4x² = 4+5
x² = 9
x = ±3

f) x² + 2x = 2x + 25
x² +2x - 2x = 25
x² = 25
√x² = √25
x = ±5