Question

2) Determine as raízes das seguintes funções:
a) y=3x+12
b) f(x)=3x/2-5
c)f(x)=-9x+81

Me ajudem por favor

Answer 1

$y = 3x + 12\\0 = 3x + 12\\3x + 12 = 0\\3x = -12\\x = -\frac{12}{3}\\ x = -4$

$f(x) = \frac{3x}{2}-5\\ \frac{3x}{2}-5 = 0\\\frac{3x}{2} = 5\\3x = 10\\x = \frac{10}{3}$

$-9x + 81 = 0\\-9x = -81\\9x = 81\\x = \frac{81}{9}\\ x = 9$