Question

2)dada a funcao f(x)=4x-5,encontre o valor de x para que a)f(x)=6 b)f(x)=-3 c)f(x)=8 d)f(x)=-8. e)f(x)=-4 f)f(x)=1/5. g)f(x)=-7/2. h)f(x)=5/3

Answer 1

f(x) = 4x - 5

f(x) = 6
4x - 5 = 6
4x = 11
x = ¹¹/₄

f(x) = -3
4x - 5 = -3
4x = 2
x = ²/₄
x = ¹/₂

f(x) = 8
4x - 5 = 8
4x = 13
x = ¹³/₄

f(x) = -8
4x - 5 = -8
4x = -3
x = ⁻³/₄

f(x) = - 4
4x - 5 = -4
4x = 1
x = ¹/₄

f(x) = ¹/₅
4x - 5 = ¹/₅
MMC = 5
20x - 25 = 1
20x = 26
x = ²⁶/₂₀
x = ¹³/₁₀

f(x) = ⁻⁷/₂
4x - 5 = ⁻⁷/₂
MMC = 2
8x - 10 = -7
8x = 3
x = ³/₈

f(x) = ⁵/₃
4x - 5 = ⁵/₃
MMC = 3
12x - 15 = 5
12x = 20
x  = ²⁰/₁₂
x = ⁵/₃