Type the correct answer in each box. Use numerals instead of words. Multiply the expressions. 3 ⁢ x 2 + 2 ⁢ x − 21 − 2 ⁢ x 2 − 2 ⁢ x + 12 ⋅ 2 ⁢ x 2 + 25 ⁢ x + 63 6 ⁢ x 2 + 7 ⁢ x − 49 If a = 1, find the values of b, c, and d that make the given expression equivalent to the expression below. a ⁢ x + b c ⁢ x + d b = , c = , and d =