Big Ideas Math Algebra 2, 2014
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Big Ideas Math Algebra 2, 2014 View details
2. Characteristics of Quadratic Functions
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Exercise 88 Page 64

You can solve for the variable by using cross products.

x=- 8

Practice makes perfect
To solve the proportion, we will use cross products.
5/2=- 20/x
5* x=2* (- 20)
5x=- 40
x=-8