[{"hint": "Find two numbers that multiply to 20 and add to −9.", "answer": "x = 4 or x = 5", "question": "Factor and solve: x² − 9x + 20 = 0"}, {"hint": "a=1, b=2, c=−8. Plug into the formula.", "answer": "x = 2 or x = −4", "question": "Use the quadratic formula to solve: x² + 2x − 8 = 0"}]