Question

3 ) determine lgebricamente os zeros das funções
A) y=-3×+1/4 b) y =-3x0-15 c)y=3/4x-1/6
D)y=9-2x

Answer 1

a)   -3x + 1/4 = 0 ⇔ 3x = 1/4 ⇔ x = 1 ÷ (3×4) ⇔ x = 1/12

b)   -3x - 15 = 0 ⇔ 3x = -15 ⇔ x = -15 ÷ 3 ⇔ x = -5

c)   (3/4)x - 1/6 = 0 ⇔ (3/2)x = 1/3 ⇔ x = (1×2) ÷ (3×3) ⇔ x = 2/9

d)   9 - 2x = 0 ⇔ 2x = 9 ⇔ x = 9/2