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Class 10 Mathematics Quadratic Equations Nature of RootsHard

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For which (m) will (x^2+mx+16=0) have equal roots?

Answer and explanation

Correct answer: (m=\pm8)

For equal roots, (D=0), so (m^2-64=0) and (m=\pm8). In exams, remember (m^2=a^2) gives (m=\pm a).

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Quadratic Equations Nature Of Roots Parameter Nature Of Roots Quadratic Equations Mathematics Class 10 Mcq

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