Solve quadratic Part A | Problem Solve for the unknown variable. x2 + x = 42, (Hint: Use factoring.) O x = 6 or -9 O x = 11 or -7 O x = -11 or 6 O x = -7 or 6 O x = -7 or -11 Question 9 Solve quadratic Part B | Problem Solve for the unknown variable. x2 + 10x = -25, (Hint: Use the quadratic formula.) O x = -10 O x = 15 O x = -5 O x = -5 or 5 O x = -10 or 15