Equal roots parameter values 1

If the equation $x^{2} - 15 - m (2 x - 8) = 0$ has equal roots, find the values of $m$ .

~8 minAnswer checked instantlydiscriminantequal roots

H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. IX. The Theory of Quadratic Equations, Examples IX.a, No. 14

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