There are four roots of ,

Step-by-step explanation:  

Given:  

Let  

Now solving the equation we get:  

Now, solving for two values of , we get;  

Now re-substituting value of , we get;  

Now we have two quadratic equation we solve for each,  

1) We will solve for  

Using quadratic formula to solve it. This gives,  

Here  

hence,  

2) We will solve for  

Using quadratic formula to solve it. This gives, 

here

Hence, from 1 and 2, we find there are 2 real roots and 2 imaginary roots.

answer: it is d

step-by-step explanation:

u = -(6/7)w

step-by-step explanation:

place all values with 'u' on one side of the equation.

4u + 8w = - 3u + 2w

4u + 3u = 2w - 8w

further simplify the equation by solving the addition and subtraction.

7u = - 6w

make 'u' the independent variable by placing its co-efficient on the right-hand side.

u = - (6/7)w