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A = 1/2 B (C - D) ^2

And I wanted to make B the subject

I have done:

2 x B = (C - D) ^ 2 / A

B = ( (C - D ^ 2) / A) / 2

Is this correct or not? And if not could you please amend it to make B the subject?

These are not the actual variables in the question by the way.

Also, how would I make D the subject in:

A = 1/2 B (C - D) ^2

Any help is appreciated. Thanks.