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4\left(6x^{2}-25x+4\right)
Factor out 4.
a+b=-25 ab=6\times 4=24
Consider 6x^{2}-25x+4. Factor the expression by grouping. First, the expression needs to be rewritten as 6x^{2}+ax+bx+4. To find a and b, set up a system to be solved.
-1,-24 -2,-12 -3,-8 -4,-6
Since ab is positive, a and b have the same sign. Since a+b is negative, a and b are both negative. List all such integer pairs that give product 24.
-1-24=-25 -2-12=-14 -3-8=-11 -4-6=-10
Calculate the sum for each pair.
a=-24 b=-1
The solution is the pair that gives sum -25.
\left(6x^{2}-24x\right)+\left(-x+4\right)
Rewrite 6x^{2}-25x+4 as \left(6x^{2}-24x\right)+\left(-x+4\right).
6x\left(x-4\right)-\left(x-4\right)
Factor out 6x in the first and -1 in the second group.
\left(x-4\right)\left(6x-1\right)
Factor out common term x-4 by using distributive property.
4\left(x-4\right)\left(6x-1\right)
Rewrite the complete factored expression.
24x^{2}-100x+16=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(-100\right)±\sqrt{\left(-100\right)^{2}-4\times 24\times 16}}{2\times 24}
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(-100\right)±\sqrt{10000-4\times 24\times 16}}{2\times 24}
Square -100.
x=\frac{-\left(-100\right)±\sqrt{10000-96\times 16}}{2\times 24}
Multiply -4 times 24.
x=\frac{-\left(-100\right)±\sqrt{10000-1536}}{2\times 24}
Multiply -96 times 16.
x=\frac{-\left(-100\right)±\sqrt{8464}}{2\times 24}
Add 10000 to -1536.
x=\frac{-\left(-100\right)±92}{2\times 24}
Take the square root of 8464.
x=\frac{100±92}{2\times 24}
The opposite of -100 is 100.
x=\frac{100±92}{48}
Multiply 2 times 24.
x=\frac{192}{48}
Now solve the equation x=\frac{100±92}{48} when ± is plus. Add 100 to 92.
x=4
Divide 192 by 48.
x=\frac{8}{48}
Now solve the equation x=\frac{100±92}{48} when ± is minus. Subtract 92 from 100.
x=\frac{1}{6}
Reduce the fraction \frac{8}{48} to lowest terms by extracting and canceling out 8.
24x^{2}-100x+16=24\left(x-4\right)\left(x-\frac{1}{6}\right)
Factor the original expression using ax^{2}+bx+c=a\left(x-x_{1}\right)\left(x-x_{2}\right). Substitute 4 for x_{1} and \frac{1}{6} for x_{2}.
24x^{2}-100x+16=24\left(x-4\right)\times \frac{6x-1}{6}
Subtract \frac{1}{6} from x by finding a common denominator and subtracting the numerators. Then reduce the fraction to lowest terms if possible.
24x^{2}-100x+16=4\left(x-4\right)\left(6x-1\right)
Cancel out 6, the greatest common factor in 24 and 6.
x ^ 2 -\frac{25}{6}x +\frac{2}{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.This is achieved by dividing both sides of the equation by 24
r + s = \frac{25}{6} rs = \frac{2}{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 = \frac{25}{12} - u s = \frac{25}{12} + u
Two numbers r and s sum up to \frac{25}{6} exactly when the average of the two numbers is \frac{1}{2}*\frac{25}{6} = \frac{25}{12}. 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>
(\frac{25}{12} - u) (\frac{25}{12} + u) = \frac{2}{3}
To solve for unknown quantity u, substitute these in the product equation rs = \frac{2}{3}
\frac{625}{144} - u^2 = \frac{2}{3}
Simplify by expanding (a -b) (a + b) = a^2 – b^2
-u^2 = \frac{2}{3}-\frac{625}{144} = -\frac{529}{144}
Simplify the expression by subtracting \frac{625}{144} on both sides
u^2 = \frac{529}{144} u = \pm\sqrt{\frac{529}{144}} = \pm \frac{23}{12}
Simplify the expression by multiplying -1 on both sides and take the square root to obtain the value of unknown variable u
r =\frac{25}{12} - \frac{23}{12} = 0.167 s = \frac{25}{12} + \frac{23}{12} = 4
The factors r and s are the solutions to the quadratic equation. Substitute the value of u to compute the r and s.