a) | | 2-5 | - | 4 | -7 || |-3| - 4 - 7 || 3 - 4 - 7 || -8 | = 8 ◄ RESPUESTA
b) | |-2 | - |-6 | || 2 - 6 || - 4 | = 4 ◄ RESPUESTA
c) | - | 5 | || - 5 | = 5 ◄ RESPUESTA
f(x) = |x - 2|
f(x) = |x² -4x + 3|
x² -4x + 3 = 0 x = 1 x = 3
f(x) = |-x² + 5x - 4|
-x² + 5x - 4 =0 x² - 5x + 4 =0 x = 1 x = 4
f(x) = |x| − x
x = 0
f(x) = |x| / x
