exam Maths Puzzle Numerical Ability

Decide all values of B in the following equations that will give one or more real number solutions.

3x squared + bx - 3 = 0
5x squared + bx + 1 = 0
-3x squared + bx - 3 = 0

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exam Other Question

Solve: -10 <_ 3x-9 <_ -2 (the _ are supposed to be under the <)

{x | ?? <_ x <_ ??} (again the _ is supposedto be under the <)

Can someone hlp me with this. Do i add 2 to each equation first?? Find the constant term that should be added to make the following expression a perfect-square trinomal. x^2+6x