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Please give all values of b in the following equations that will give one or more real number solutions?

a) 3x^2 + bx - 3 = 0

b) 5x^2 + bx + 1 = 0

c) -3x^2 + bx - 3 = 0

d) Write a rule for judging if an equation has solutions by looking at it in standard form.

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