Multiple choice Add 7x2 + 8x + 3 and 8x + 3x2 + 9. 8x2 + 16x + 12 10x2 + 8x + 12 10x2 + 16x + 12 10x2 + 16x + 6 None of these Reveal answer Fill a bubble to check yourself C Correct answer Explanation 7x2 + 8x + 3 + 8x + 3x2 + 9 = 8x + 3x2 + 9 + 7x2 + 8x + 3 = 10x2 + 16x + 12