1. MilaCoolNess

whats the question

2. creighton

what is the discriminate of this equation: y=-4(x-3)^2+8

3. creighton

hears the graph

4. zainulafaq

the discriminant is 2128 do you want me to explain it as well?

5. Avva

you can simply calculate the discriminate \[b^{2} - 4ac\] by putting the equation in the form \[y=ax^{2} + bx +c\]

6. creighton

7. Avva

@zainulafaq is it 2128 or 128 ?

8. creighton

does the B and C stand as coordinates

9. zainulafaq

firstly expand the equation to standard for i.e \[a x^{2} +bx +c\] which in this case is \[-4x^2 +24x -28\]

10. zainulafaq

a, b, c are coefficients of \[x^2 , x \] and constant respectively in the expanded form . .

11. Avva

no they are not coordinates it tells u the nature of the roots whether they are real or imaginary

12. creighton

k I got it so far Do we solve for x?

13. zainulafaq

then use the formula for discriminant as @Avva has suggested to find value of discriminant a=-4, b-24, c= -28

14. creighton

??

15. zainulafaq

No if the question asks for discriminant you just have to tell the numerical value of \[[b^2 - 4ac] \]

16. creighton

k so if we plug in the numbers -24^2-4(-4)(-28)

17. creighton

right?

18. zainulafaq

exactly thats perfect

19. creighton

and we simplify to get our answer right

20. creighton

@zainulafaq so is it 130 and my work is shown below @zainulafq -24^2-4(-4)(-28) 576+16(-28) 576-448=130

21. zainulafaq

all of it is excellent except for last step . . 576-448 = 128 not 130 . . .

22. creighton

whoops so 128 is my answer

23. zainulafaq

yup now its fine :)

24. creighton

thanks

25. zainulafaq

welcome :)