(Q11-Q20) 1 - 3 Determining the Types of the two Roots of a Quadratic Equation.

 

 

 

1sec ≫ First term  ≫ Algebra ≫ Unit 1 ≫ 1 - 3 Determining the Types of the two Roots of a Quadratic Equation.

Back to questions page 

(Q11 To Q20)

(11) If the two roots of each of the following quadratic equations are equal, find the value of $k$:
$x^2 - 2kx + 7k - 6x + 9 = 0$, then find the two roots.

Solution on YouTube

The correct answer is: $0,3,3$ or $1,4,4$.

(12) If $L$ and $M$ are two rational numbers, then prove that the two roots of the equation:
$Lx^2 + (L - M)x - M = 0$ are rational numbers.

Solution on YouTube

The correct answer with explanation is: [prove by your self using discriminant]