Question

Como resolver f(x)=-10

Answer 1

$\left|\begin{array}{ccc}x&y&1\\0&0&1\\-1&-2&1\end{array}\right| = 0$

$-y + 2x = 0$

$-y = -2x$

$y = 2x = f(x)$

$f(x) = -10$

$2x = -10$

$\boxed{x = -5}$

Espero ter ajudado. :))

Answer 2

- y + =0
- y =-2.x
y=2x=F(x)
F(x)=-10
2x=-10
x=-5