exam Maths Puzzle Numerical Ability

what do you call the number/value in the x position of something like the log x base 2

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exam Other Question

Solve by using the quadratic formula x^2 = -5x - 5 we are doing these types of questions in class. i am having a problem understanding how to solve.can you help?

the foci of the ellipse x^2/a^2+y^2/b^2=1b>a are_______

thanks for any insight into this..