What number would you add to complete the square for the equation below?

x^2+10x=0

26 is 33.33% of 78

step-by-step explanation:

26 is what percent of 78?

26 is p% of 78

equation: y = p% * x

solving our equation for p

p% = y/x

p% = 26/78

p = 0.3333

convert decimal to percent:

p% = 0.3333 * 100 = 33.33%

step by step explanation: when u removing the parentheses and combined them that would be : x+3y-x-y=2y