Question

Dada a função real f: R em R definida por f(x)=15x-2, o valor de f(3) será?

Answer 1

Resposta:

$(x)=15x-2\\\\x=15x-2\\\\x-15x=15x-2-15x\\\\x-15x=15x-2-15x\\\\\frac{-14x}{-14}=\frac{-2}{-14}\\\\\frac{-14x}{-14}\\\\=\frac{14x}{14}\\\\\frac{-2}{-14}\\\\=\frac{2}{14}\\\\x=\frac{1}{7}$