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Select all of the following that are quadratic equations.


3x2 + 5x - 7 = 0

x3 - 2x2 + 1 = 0

2x - 1 = 0

5x2+ 15x = 0

6x - 1 = 4x + 7

x2 - 4x = 4x + 7

Verified Answer :

M8Rod

all except the 2nd, 3rd, and 5th

Answer:

\(3x^2 + 5x - 7 = 0\), \(5x^2+ 15x = 0\) and \(x2 - 4x = 4x + 7\) are quadratic equations.

Step-by-step explanation:

We are required to find the quadratic equations.

Now, as we know,

Quadratic equation is an equation having degree 2 and is of the form \(ax^2+bx+c=0\).

So, according to the options, we see that,

The equations \(x^3 - 2x^2 + 1 = 0\), \(2x - 1 = 0\) and \(6x - 1 = 4x + 7\) have degree 3, 1 and 1 respectively.

Thus, these equations are not quadratic equations.

Hence, the equations 1, 4 and 6 are quadratic equations.

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