Simplify: −3(4x + 5)(2x + 4)
a) 8x2 + 26x + 20
b) −24x2 + 78x + 60
c) −8x2 − 26x − 20
d) −24x2 − 78x − 60

Solve 2x+y=3 x+y=5 in substitution method

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.

What is the least common multiple for 6 and 8? what is the least common multiple for 4 and 12 ? what is the least common multiple for 11 and 12? what is the least common multiple for 3 and 6?