When finding roots, or x values, of an algebraic expression, set the expression equal to zero, then solve for the x value, satisfying the algebraic equation.
Steps to Find a Root
1. Set the algebraic expression equal to zero.
2. Find a value of x that satisfies the algebraic equation, or isolate the value of x to one side of the equation and solve for x.
The Root
They call me a hero
Because I satisfy f(x)=0.
But all I am is a root
Because when you add me,
Subtract me,
Multiply me by any numeric value
I make a zero
Because I am extraneously impossible.
=> means therefore
1. x+1
x+1= 0 => x+1-1= 0-1 => x= -1
2. x-3
x-3= 0 => x-3+3= 0+3 => x= 3
3. 2x
2x= 0 => 2x(1/2)= 0(1/2) => x=0
4. 2x+1
2x+1= 0 => 2x+1-1= 0-1 => 2x= -1 => 2x(1/2)= -1(1/2) => x= -1/2
5. 5x-10
5x-10= 0 => 5x-10+10= 0+10 => 5x= 10 => 5x(1/5)= 10(1/5) => x= 2
