Answer:
Solution of the given equation: 
Step-by-step explanation:
An equation is a mathematical statement that states that two things are equal to each other.
A linear equation in one variable is of the form
where a,b,c are coefficients and x is variable .
Here. given: 
Using rule (Multiplication is distributive over addition) :
,
we can write this equation as,

On comparing this equation with
- (sum of roots)
+(product of roots) = 0, we get
sum of roots=3 (7-4)
product of roots = -28 
Using this fact , we can write this equation as ,
