exam Maths Puzzle Numerical Ability

simplify the square root of 100 if possible

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I need some help on quatratic equations. The first question is:
The discriminant of the quadratic equation -2x^2+8x+5?

Thank you in advance for your help!!! ok i dont no how to do this prob

write each expression using positive exponents. then evaluate the expression

2 to the negative power of 6

and i dnt no how to do the pwer thing on the ccomputer