Concept explainers
Here we celebrate the power of algebra as a powerful way of finding unknown quantities by naming them, of expressing infinitely many relationships and connections clearly and succinctly, and of uncovering pattern and structure.
Negative x? A triangle is drawn on a surface having negative curvature. Two of the angles measure 80 degrees. If x is the measure of the third angle, and x satisfies the equation
(There’s only one value for x that works. What is it and why ?)
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