Grade 12Algebra
if the equation ax^3 - 9x^2 + 12x - 5 = 0 has two equal real roots then the 'a' equals
if the equation ax^3 - 9x^2 + 12x - 5 = 0 has two equal real roots then the 'a' equals
1 Answer
Jayant Kishore
As it has repeated real roots this means for
y=ax3 – 9x2 +12x -5
dy/dx must be zero at that point .
dy/dx =3ax2-18x+12=0
for dy/dx to have real root D>=0 => a
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