Simplificar 55-56 entre 4×2+82×3​

If i have 20$ and i gave 5$ away how much i got

Parabolas y=−2x^2 and y=2x^2 +k intersect at points a and b that are in the third and the fourth quadrants respectively. find k if length of the segment ab is 5.

Find the solution(s) to x^2-14+49=0