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Find the roots of the quadratic equations by applying the quadratic formula.
$2x^2 - x + 4 = 0$
Given:
Given quadratic equation is $2x^2-x +4 = 0$.
To do:
We have to find the roots of the given quadratic equation.
Solution:
$2x^2-x + 4 = 0$
The above equation is of the form $ax^2 + bx + c = 0$, where $a = 2, b = 1$ and $c = - 4$
Discriminant $\mathrm{D} =b^{2}-4 a c$
$=(1)^{2}-4 \times 2(-4)$
$=1+32$
$=33$
$\mathrm{D}>0$
Let the roots of the equation are $\alpha$ and $\beta$
$\alpha =\frac{-b+\sqrt{\mathrm{D}}}{2 a}$
$=\frac{-1+\sqrt{33}}{4}$
$\beta =\frac{-b-\sqrt{\mathrm{D}}}{2 a}$
$=\frac{-1-\sqrt{33}}{4}$
Hence, the roots of the given quadratic equation are $\frac{-1+\sqrt{33}}{4}, \frac{-1-\sqrt{33}}{4}$.
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