Use any method to solve the equation. If necessary, round to the nearest hundredth. 9x^2-21=0

Mathematics

1 answer:

zavuch27 [327]3 years ago

7 0

Answer:

x = 1.53, -1.53.

Step-by-step explanation:

9x^2 - 21 = 0

9x^2 = 21

x^2 = 21/9

x = +/- √21 / 3

x = 1.53, -1.53.

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To start off, let's start with some facts that will help us solve this:

Supplementary angles are two angles whose angle measures add up to 180 degrees. You can know that they are supplementary because they can be connected by a straight line.

Triangles (all of them) have angles that add up to 180 degrees.

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