In Exercises 44–46, find the sum or quantity without com- pletely expanding or calculating any sums. 44. Given E az = 12 and E2 az = 23, find a2. 45. Given ak = 7, E-, bx = 10, and ao = 2, find the value of E-o(2az + 3br). =D0 46. Given , k = 325 and (k– 3)² = 14, 910, find the value of E (k2 – 5k + 9).

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