Question

Find the value of k for the following quadratic equation, so that they have two equal roots :
(i) 2x² + 8x - k³

Answer 1

Answer:

Answer is -2

Explanation :

• sum of roots of the equation

$sum \: of \: roots \: ( \: \alpha and \beta ) \: of \: the \: equation \: ax { }^{2} + bx + c = 0 \: is \: - b \div a$

• since roots are equal you will get roots of equation
• substitute in the given

Hope you understand this