HelpSolution6 discriminant means the part which is under squ

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Solution

6. discriminant means the part which is under square-root of the roots of the equation ax²+bx+c=0

now the roots are x={-b+-sqrt[b²-4ac]}/2a

hence discriminant is b²-4ac

hence thethe matched letter is C   [answer]

7. the standard form a quadratic equation is y=a(x-h)²+k

for different values of a,h and k we can get different types of quadratic equations

like for a=1,h=k=0 we get y=x²

hence the matched letter is D. [answer]

8. for minimum value of b²-4ac which is 0 we get value of root of the equation ax²+bx+c=0 be -b/2a

hence the matched letter is A. [answer]