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Answer:

Answers are below.

Step-by-step explanation:

x2 - 2 x = 4 x + 12

x2+ 12 x = 0

x2 + 8 = 0

9x2 + 6 x - 3 = 0

These are all quadratic equations because they have x2 in all of them.

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Answer:

x^2 - 2x = 4x + 1

2x^2 + 12x = 0

9x^2 + 6x - 3 = 0.

Step-by-step explanation:

A quadratic equation will contain a term with an exponent of 2 as the highest exponent.