Question

If k(x) = 5x - 6, which expression is equivalent to (k + k)(4)?

Answer 1

$\large \boxed{(k + k)(4) = k(4) + k(4)}$

First, we find the value of k(4). We can find the value of k(4) by substituting x = 4 in k(x).

$\large{k(x) = 5x - 6 \longrightarrow k(4) = 5(4) - 6} \\ \large{k(4) = 20 - 6 \longrightarrow 14}$

Therefore the value of k(4) is 14. Next we find k(4)+k(4) which is equivalent to 14+14. Hence, the value of (k+k)(4) is 28. There's also another method.

$\large \boxed{(k + k)(4) = 2k(4)}$

As we know k(4) is 14. Therefore 2k(4) is 2×14 = 28.

Answer

• (k+k)(4) = 28

Answer 2

28! hope this helps, you just plug in 4 for x, and then multiply by two.