What method would you choose to solve the equation 2x2 - 7 = 9? Explain why you chose this method.

Question

Mathematics

Alyssa Hansen

9 March, 19:04

What method would you choose to solve the equation 2x2 - 7 = 9? Explain why you chose this method.

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Answers (2)

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Jagger Shelton · Answer 1

Since there is a power of 2 and constants, without a variable power of 1, I would use square root method.

Move the 7 to the right and you get 2x^2 = 16

Then divide both sides by 2 and get x^2 = 8

Now take the square root of each side and get x = + - sqrt 8

sqrt 8 can be simplified since 2*4 = 8 and 4 is a perfect square.

Therefore the final answer is x = + - 2sqrt2

Luciano Barrera · Answer 2

I would use the square root property of equality. Because there is no x term, I would just add and divide to get x2 by itself. Then I would take the square root.