Algebra Examples
x=1x=1 , x=3x=3
Step 1
Since the roots of an equation are the points where the solution is 00, set each root as a factor of the equation that equals 00.
(x-1)(x-3)=0(x−1)(x−3)=0
Step 2
Step 2.1
Expand (x-1)(x-3)(x−1)(x−3) using the FOIL Method.
Step 2.1.1
Apply the distributive property.
x(x-3)-1(x-3)=0x(x−3)−1(x−3)=0
Step 2.1.2
Apply the distributive property.
x⋅x+x⋅-3-1(x-3)=0x⋅x+x⋅−3−1(x−3)=0
Step 2.1.3
Apply the distributive property.
x⋅x+x⋅-3-1x-1⋅-3=0x⋅x+x⋅−3−1x−1⋅−3=0
x⋅x+x⋅-3-1x-1⋅-3=0x⋅x+x⋅−3−1x−1⋅−3=0
Step 2.2
Simplify and combine like terms.
Step 2.2.1
Simplify each term.
Step 2.2.1.1
Multiply xx by xx.
x2+x⋅-3-1x-1⋅-3=0x2+x⋅−3−1x−1⋅−3=0
Step 2.2.1.2
Move -3−3 to the left of xx.
x2-3⋅x-1x-1⋅-3=0x2−3⋅x−1x−1⋅−3=0
Step 2.2.1.3
Rewrite -1x−1x as -x−x.
x2-3x-x-1⋅-3=0x2−3x−x−1⋅−3=0
Step 2.2.1.4
Multiply -1−1 by -3−3.
x2-3x-x+3=0x2−3x−x+3=0
x2-3x-x+3=0x2−3x−x+3=0
Step 2.2.2
Subtract xx from -3x−3x.
x2-4x+3=0x2−4x+3=0
x2-4x+3=0x2−4x+3=0
x2-4x+3=0x2−4x+3=0