Question

Darrell tried to solve the equation x^2 + 10x = -9 by completing the square.

His work and some of his answers are shown below. Each red blank, marked with a letter A, should be filled in with the same number.

Each blue blank, marked with the letter B, should be filled in with the same expression.

Each green blank, marked with the letter C, should be filled in with the same number.

Enter the number, expression, and number that fill in blanks A, B, and C correctly. Separate your answers with commas, like this: 42, 3x-4, 53