Minimum Value of Quadratic

Find the minimum value of $x^{2} - 12 x + 40$ .

~5 minAnswer checked instantlyQuadratic extremaCompleting the square

H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. XIX. Inequalities, Examples XIX.a, No. 15 (part 1)

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Checked against the answer in H. S. Hall & S. R. Knight, Higher Algebra (1891).