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Which of the following are quadratic equations?
(i) $x^2\ +\ 6x\ - 4\ =\ 0$
Given:
Given quadratic equation is $x^2\ +\ 6x\ - 4\ =\ 0$.
To do:
We have to check which of the given equations are quadratic.
Solution:
The standard form of a quadratic equation is $ax^2+bx+c=0$.
$x^2\ +\ 6x\ - 4\ =\ 0$
The given equation is of the form $ax^2+bx+c=0$ where $a=1, b=6$ and $c=-4$.
Therefore, $x^2\ +\ 6x\ - 4\ =\ 0$ is a quadratic equation.
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