Question

9.02] What are the solutions of 6x2 − x − 15 = 0?

x = 5 over 6, x = −3

x = −5 over 6, x = 3

x = 3 over 2, x = −5 over 3

x = −3 over 2, x =5 over 3

Answer 1

Do you know how to use the quadratic formula?

Answer 2

Yeah, but I don't understand it, sorry about that!

Answer 3

Do you mind writing out the quadratic equation? I'll show you how to use it to solve this equation.

Answer 4

You still there?

Answer 5

Yep, I'm here! Ok, I will, wait a sec! :D

Answer 6

Just google; quadratic formula.

Answer 7

y = ax2 + bx + c

Answer 8

Um, that is not really correct. look at the attachment.

Answer 9

Can you view the attachment? If so, can you see the letters a, b, c? They are the ones that will get replaced with numbers from your equation: 6x2 − x − 15 = 0

Answer 10

Yep, I saw it, but the lesson put this....
A quadratic equation is an equation of the form y = ax2 + bx + c, where “a”, “b” and “c” are real numbers

Answer 11

Alright, then call this the quadratic formula.

Answer 12

Now replace the a with 6, the b with -1, and c with -15. Do you know where i got these numbers?

Answer 13

from the equation in the question.

Answer 14

yes.

Answer 15

Can you draw that out? with the letters replaced with the numbers that I posted above?

Answer 16

a with 6, the b with -1, and c with -15.