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# C3 maths / general algebra question watch

1. If you have something like
(2x + x^2)^2 + 4 = 5

Can you solve it by subtracting four, square rooting, etc. Or do you have to expand the bracket?

Edit: never mind I understand
2. (Original post by NeeIam)
If you have something like
(2x + x^2)^2 + 4 = 5

Can you solve it by subtracting four, square rooting, etc. Or do you have to expand the bracket?
You could, as long as you are careful...

You could confirm this anyway by doing both methods.
3. (Original post by NeeIam)
If you have something like
(2x + x^2)^2 + 4 = 5

Can you solve it by subtracting four, square rooting, etc. Or do you have to expand the bracket?
That's fine, but remember that when you take the square root there are two solutions.

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Updated: January 27, 2017
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