Question

The equation 3x² - 12x + ( n - 5 ) = 0 has equal roots. Find the value of n.


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Answer 1

Answer:

A quadratic equation has equal roots if its discriminant is zero.

b²-4ac

here

a=3

b=(-12)

c=(n-5)

b²-4ac

=12²-4×3(n-5)

144-12(n-5)=0

⇒144-12n+60=0

⇒12n=204

⇒n=17

Answer 2

Hey Mate Ur Answer :-

• 3x² - 12x + ( n - 5 ) = 0

Here *a = 3x²

*b = 12x

*c = (n - 5)

b² - 4ac = 0

=》 (12)² - 4(3) (n - 5) = 0

=》 144 - 12n + 60 = 0

=》 -12n = -204

=》 n = -204/-12

=》 n = 17

☆ HOPE IT HELPS U ☆