Question

リン
g) f(x) = x - 6x2 + 8x​

Answer 1

$f(x) = x - 6 \times 2 + 8x$

$0 = x - 12 + 8x$

$0 = 9x - 12$

$- 9x = - 12$

$x = \frac{4}{3}$