How to solve this problem.... 20(7789) - (217)(579) __________________________________________ 20(3493) - (217)2][20(19647)-(579)2]

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section10.2: Arithmetic Sequences
Problem 51E
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How to solve this problem....

20(7789) - (217)(579)

__________________________________________

20(3493) - (217)2][20(19647)-(579)2]

My answer is .83 but how do I do the work to get the answer?

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