exam Maths Puzzle Numerical Ability

When solving a quadratic equation you have 0,1,2 solutions. What does this mean "graphically?

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exam Other Question

2^x+2 - 2^x = 48

thanks. sorry for all the questions. your help is great. Find the Domain of the function:

(x^4 - 2x^2 +7)/ (3x^2 -10x -8)