What is the first step in solving the quadratic equation -5x2+8=133?

First isolate the term containing x by subtracting 8 from both sides: -5x² + 8 - 8 = 133 - 8, so -5x² = 125. Then you can divide by -5 and solve for x². The correct choice is subtracting 8 from both sides of the equation.

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