Question

simplify. 2c - 9c

Explanation:

Step1: Combine like - terms

Both $2c$ and $-9c$ are like - terms. We use the distributive property $ac+bc=(a + b)c$. Here $a = 2$ and $b=-9$.
$2c-9c=(2 - 9)c$

Step2: Calculate the coefficient

Calculate $2-9=-7$.
$(2 - 9)c=-7c$

Answer:

$-7c$