Skip to main content
Factor
Tick mark Image
Evaluate
Tick mark Image
Graph

Similar Problems from Web Search

Share

a+b=-4 ab=1\times 3=3
Factor the expression by grouping. First, the expression needs to be rewritten as x^{2}+ax+bx+3. To find a and b, set up a system to be solved.
a=-3 b=-1
Since ab is positive, a and b have the same sign. Since a+b is negative, a and b are both negative. The only such pair is the system solution.
\left(x^{2}-3x\right)+\left(-x+3\right)
Rewrite x^{2}-4x+3 as \left(x^{2}-3x\right)+\left(-x+3\right).
x\left(x-3\right)-\left(x-3\right)
Factor out x in the first and -1 in the second group.
\left(x-3\right)\left(x-1\right)
Factor out common term x-3 by using distributive property.
x^{2}-4x+3=0
Quadratic polynomial can be factored using the transformation ax^{2}+bx+c=a\left(x-x_{1}\right)\left(x-x_{2}\right), where x_{1} and x_{2} are the solutions of the quadratic equation ax^{2}+bx+c=0.
x=\frac{-\left(-4\right)±\sqrt{\left(-4\right)^{2}-4\times 3}}{2}
All equations of the form ax^{2}+bx+c=0 can be solved using the quadratic formula: \frac{-b±\sqrt{b^{2}-4ac}}{2a}. The quadratic formula gives two solutions, one when ± is addition and one when it is subtraction.
x=\frac{-\left(-4\right)±\sqrt{16-4\times 3}}{2}
Square -4.
x=\frac{-\left(-4\right)±\sqrt{16-12}}{2}
Multiply -4 times 3.
x=\frac{-\left(-4\right)±\sqrt{4}}{2}
Add 16 to -12.
x=\frac{-\left(-4\right)±2}{2}
Take the square root of 4.
x=\frac{4±2}{2}
The opposite of -4 is 4.
x=\frac{6}{2}
Now solve the equation x=\frac{4±2}{2} when ± is plus. Add 4 to 2.
x=3
Divide 6 by 2.
x=\frac{2}{2}
Now solve the equation x=\frac{4±2}{2} when ± is minus. Subtract 2 from 4.
x=1
Divide 2 by 2.
x^{2}-4x+3=\left(x-3\right)\left(x-1\right)
Factor the original expression using ax^{2}+bx+c=a\left(x-x_{1}\right)\left(x-x_{2}\right). Substitute 3 for x_{1} and 1 for x_{2}.
x ^ 2 -4x +3 = 0
Quadratic equations such as this one can be solved by a new direct factoring method that does not require guess work. To use the direct factoring method, the equation must be in the form x^2+Bx+C=0.
r + s = 4 rs = 3
Let r and s be the factors for the quadratic equation such that x^2+Bx+C=(x−r)(x−s) where sum of factors (r+s)=−B and the product of factors rs = C
r = 2 - u s = 2 + u
Two numbers r and s sum up to 4 exactly when the average of the two numbers is \frac{1}{2}*4 = 2. You can also see that the midpoint of r and s corresponds to the axis of symmetry of the parabola represented by the quadratic equation y=x^2+Bx+C. The values of r and s are equidistant from the center by an unknown quantity u. Express r and s with respect to variable u. <div style='padding: 8px'><img src='https://opalmath.azureedge.net/customsolver/quadraticgraph.png' style='width: 100%;max-width: 700px' /></div>
(2 - u) (2 + u) = 3
To solve for unknown quantity u, substitute these in the product equation rs = 3
4 - u^2 = 3
Simplify by expanding (a -b) (a + b) = a^2 – b^2
-u^2 = 3-4 = -1
Simplify the expression by subtracting 4 on both sides
u^2 = 1 u = \pm\sqrt{1} = \pm 1
Simplify the expression by multiplying -1 on both sides and take the square root to obtain the value of unknown variable u
r =2 - 1 = 1 s = 2 + 1 = 3
The factors r and s are the solutions to the quadratic equation. Substitute the value of u to compute the r and s.