Question

O zero da função f(x) = kx + 12 é 4. Determine o k:
a) k = -3
b) k = 3
c) k = 0
d) k = 2
e) k = -2

Answer 1

$\mathsf{f(x)=kx+12}\\\mathsf{f(4)=4k+12}\\\mathsf{4k+12=0}\\\mathsf{4k=-12}\\\mathsf{k=-\dfrac{12}{4}}$

$\huge\boxed{\boxed{\boxed{\mathsf{k=-3\checkmark}}}}$