Maximum Value of Quadratic

Find the maximum value of $24 x - 8 - 9 x^{2}$ .

~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 2)

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