Question

9x^2 + 16x = 0

Answer 1

Well - One solution would be that x = 0.

Answer 2

and what would I do next?

Answer 3

I would use This -----> http://www.wolframalpha.com/input/?i=9x%5E2+%2B+16x+%3D+0 <-----

Answer 4

okay! and for this one would i need to use the imaginary letter i?

Answer 5

Nope - Not that I know of :)

Answer 6

OK thanks!

Answer 7

No problem! Take care!

Answer 8

@charlotte123 what about when I have to find the vertex?

Answer 9

@helpme1.2 do u know how to do it?

Answer 10

you want to find the x?

Answer 11

the c would be 0

Answer 12

I need to complete the square

Answer 13

to complete the square, find half the number of the b term and add it to both sides
b in this case is 16

Answer 14

So it's: 9x^2 + 16x + 16 = 16 ?

Answer 15

no, take half of the b term, so you first divide 16 by 2 which equals 8
the 8 is what you should be adding, not 16

Answer 16

ohh that's be 64

Answer 17

9x^2 + 16x + 64 = 64

Answer 18

no, lets start all over again
first lets divide everything by 9 so the x^2 would be simplified

Answer 19

9x^2 + 16x = 0 ---> divide every thing by 9
x^2 +16x/9 = 0 ----> now take have of the coefficient and square

Answer 20

x^2 +16x/9 + 64/81 = 0 +64/81