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Philo Farnsworth

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Philo Taylor Farnsworth (August 19, 1906 - March 11, 1971) was an American inventor of the vacuum tube television display.

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Quadratic formula

... getting <math>x^2+\frac{b}{a}x+\frac{b^2}{4a^2}=-\frac{c}{a}+\frac{b^2}{4a^2}.</math> The left side is now a perfect square; it is the square of (x + ...