What is the first step in solving the quadratic equation x2 – 40 = 0?

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solve the given quadratic equations by factoring. $$40 x-16 x^{2}=0$$

What is the first step in solving the quadratic equation x^2-40=0 A. taking the square root of both side of the equation B. adding 40 to both sides of the equation C. squaring both sides of the equation

D. subtracing 40 from both sides of the equation