to complete the square equation x²+10x, we need to add 5 to both sides. (True or false) to complete the square in the equation x²+20x, we need to add 100 to both sides. (T/F)to complete the square in the equation x²+16x, we need to add 8 to both sides. (T/F)to complete the square in the equation x²+8x, we need to add 16 to both sides. (T/F)