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12x² + 18 = 1470
12x² = 1470 - 18
12x² = 1452
x² = 1452/12
x² = 121
x = +/- √121 Tiene como solución 2 raices reales
x = √121
x = 11 Porque 11 * 11 = 121
o
x = - √121
x = - 11 Porque (- 11)(- 11) = 121
Solución.
(- 11 , 11)
12x² = 1470 - 18
12x² = 1452
x² = 121
CS = (-11;11)