(5x-17) (2x+10) find mP

Place the following steps in order to complete the square and solve the quadratic equation,

If 3x+8=3x+8 is it one solution or no solution

He mass of a single atom of carbon can be found by dividing the atomic mass (12.01 g) by 6.022 x 10^23. which is the mass of a single carbon atom, correctly written in scientific notation with the correct number of significant figures?