The best replacement for quadratic formula is completing the square.

The best alternatives to quadratic formula are rated as following:

★★★★★	completing the square
★★★★	factoring
★★★	equation
★★	quadratic equation
★	by factoring

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Speaking about quadratic formula, one probably shouldn't forget about imaginary numbers.

Other search terms related to quadratic formula and their ratings are:

★★★★★	imaginary numbers
★★	imaginary roots
★	complex roots

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Google Trends

Scale is based on the average worldwide traffic of quadratic formula in all years. Click on graph for more.

quadratic formula

completing the square

factoring