Question

Solve
3p^2 = -8p -5

Answer 1

do you know the first step?

Answer 2

i need to get the equation to one side

Answer 3

good job so what do you need to do so one part of the equation can be in one side?

Answer 4

add -8p -5 or subtract -3p^2

Answer 5

close but first you need to put all the numbers together and the variables in the other side so now do you know what to do?

Answer 6

no I'm confused

Answer 7

yes but how does that relate to my problem?

Answer 8

it's exactly what the problem is but different number and variable

it's not that you don't understand it's that you want the answer instead of doing the work

Answer 9

haha no i don't…..i know my homework is based on what we learned in class and this is not what i learned. and i want to "do the work: so i know how to do the work on my test...

Answer 10

and the example i gave you was exactly what your question is but different number and variable once again so you should be able to understand this.

Answer 11

okay its just I'm suppose quadratic formula, completing the square or simple factoring but idk what aim doing wrong

Answer 12

and i already know the answer to the question

Answer 13

so what is it?

Answer 14

-1 and -5/3 i know the answer but i want to know how to get it

Answer 15

i'm done how do you know the answer if you don't know how you got it

Answer 16

my book gives the answer to the odd questions so you can check your work...

Answer 17

3p^2 = -8p -5
Add (8p+5) to both sides:
3p^2 + 8p + 5 = 0
3p^2 + 3p + 5p + 5 = 0
Can you factor it from here on?

Answer 18

how did you get 3p + 5p? did you split the middle?

Answer 19

3p^2 + 8p + 5 = 0
multiply a and c (ax^2 + bx + c = 0)
3 * 5 = 15
split 15 into two factors such that their sum is 8
you can try 1 x 15 (that won't work)
3 x 5 (will work, their sum is 8 and their product is 15).
so 3p^2 + 3p + 5p + 5 = 0

Answer 20

oh okay thank you but i have one more question how do i know when to use the quadratic formula, completing the square or just simple factoring?

Answer 21

completing the square is not usually used for solving a quadratic equation.
It is usually done to put the equation of a parabola in a vertex form.
Solving for x (or find the roots or zeros of a quadratic equation) the choice is usually between factoring ans using the quadratic formula. I will attempt factoring first.
And if there is no easy factoring then I will resort to the quadratic formula.

Answer 22

okay thank you!

Answer 23

you are welcome.