Does anyone know how to do this?

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.

Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?

Evaluate 8j -k+148j−k+14 when j=0.25j=0.25 and k=1k=1.