If b=sqrt(4ac-d) Then What is a^2-2b^2+c^2?

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1 Answer
May 20, 2018

a^2-8ac+2d+c^2

Explanation:

b=sqrt(4ac-d)
a^2-2b^2+c^2

substitute b into the second equation:

a^2-2(sqrt(4ac-d))^2+c^2

a^2-2(4ac-d)+c^2

a^2-8ac+2d+c^2