How to calculate density for a 6th grader

Solve each quadratic equation by factoring and using the zero product property. 10x + 6 = -2x^2 -2

Find │–14│ a. 14 b. –14 c. start fraction 1 over 14 end fraction

Sanjay solved the equation below. which property did he use to determine that 7x+42=42 is equivalent to 7(x+6)=42 7x+42=42 7x=0 x=0