Answer:
x = 0, -4 and -3.
Step-by-step explanation:
The given expression is "3x to the power of 3 + 21x squared + 36x = 0".
We can write this expression as follows :

Taking 3x common.

x = 3

Hence, the solution of the given quadratic equation are x = 0, -4 and -3.
Answer:
{9,14,20}
Step-by-step explanation:
hope it helps
Answer:
10 books per box
Step-by-step explanation:
40÷4
=10
10×4= 40