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How do you find the value of the discriminant and state the type of solutions given #-6x^2-6=-7x-9#?

Answer 1

Abigail Allen

Solutions are two rational numbers.

#-6x^2-6=-7x-9#

#hArr6x^2+6-7x-9=0#

or #6x^2-7x-3=0#

Discriminant of quadratic equation #ax^2+bx+c=0# is #Delta=b^2-4ac#

Here #Delta=(-7)^2-4xx6xx(-3)=49+72=121# i.e. #Delta > 0# and is square of #11#

Hence, solutions are two rational numbers.

These are given by #(-b+-sqrtDelta)/(2a)# and here these are

#7/12+-11/12# i.e. #3/2# and #-1/3#

For detail see here.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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