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Algebra Difficulty 1.9 Junior Find the answer
For every real number x, what is the value of the expression (x+1)2−x2?
A number or a short expression. Fractions can be typed as 3/2, and spacing doesn't matter.
Solution
Expanding and simplifying, (x+1)2−x2=(x2+2x+1)−x2=2x+1.
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