I think of a number, double it, and subtract two. I get nine. What is the number I began with?
1 answer:
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x² + 50
= x² - (-50)
= Side note:
= (x + 5i)(x - 5i)
x² + 50
= x² - (-50)
= Side note:
= (x + 5i)(x - 5i)