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3 (x² + 2x (- 1) + (- 1)² - (4x - 4 * 3) = (x * 3x - x * 4) - 5
3x² - 6x + 3 - 4x + 12 = 3x² - 4x - 5
3x² - 10x + 15 = 3x² - 4x - 5
3x² - 3x² - 10x + 4x = - 5 - 15
- 6x = - 20
x = - 20/-6
x = 10/3
Solución :
x = 10/3
VERIFICAMOS :
3 (x - 1)² - 4 (x - 3) = x (3x - 4) - 5
3 (10/3 - 1)² - 4 (10/3 - 3) = 10/3 ( 3 * 10/3 - 4) - 5
3 (10 - 3)²/3 - 4 (10 - 9)/3 = 10/3 (3 * 2 * 5 )/3 - 4) - 5
(3 * 7²)/3 - 4/3 = 10/3 (2 * 5 - 4) - 5
(7² + (- 2²))/3 = (2 * 5)/3 * 6 - 5
(49 - 4)/3 = (2 * 5)/3 * 6 - 5
45/3 = (6 * 2 * 5)/3 - 5
15 = (60)/3 - 5
15 = 20 - 5
15 = 15
Listo!!!