Question

Select all of the following that are quadratic equations.

3x ^2 + 5x - 7 = 0
x ^3 - 2x ^2 + 1 = 0
2x - 1 = 0
5x ^2+ 15x = 0
6x - 1 = 4x + 7
x ^2 - 4x = 4x + 7

Answer 1

5x ^2+ 15x = 0
3x ^2 + 5x - 7 = 0
x ^2 - 4x = 4x + 7

Answer 2

Answer: First, Fourth, Sixth are correct options.

Explanation:

Since we know that

Quadratic equation are those equations in which the highest degree should be 2.

So, According to this rule, we get that

`3x ^2 + 5x - 7=0\\\\x ^2 - 4x=4x + 7\\\\5x ^2+ 15x=0`

Hence, First, Fourth, Sixth are correct options.