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You are supposed to calculate the so-called discriminant, b2 - 4ac. If the result is positive, the equation has two real solutions; if it is zero, one real solution; if it is negative, no real solution (and two complex solutions).

For this particular equation, a = 1, b = -10, and c = 25.

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Q: How many and what type of solutions does the quadratic function x2 -10x plus 25 equals 0 have?
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