Question

Help pls? Will award medal!
What is the solution to x2 + 3x + 25 = 0?

Answer 1

Do you think the equation is factorable?

Answer 2

I'm not sure if you meant 2x instead of x2.

Answer 3

No.. and its x^2

Answer 4

x2 means \(x^2\)

Answer 5

Ah okay, thats what I originally thought, but I felt it was more basic. :P Sorry hehe

Answer 6

use wolframalpha.com
and type in factor "your equation"

Answer 7

The solution is actually imaginary :)

Answer 8

Or no real solutions

Answer 9

So I'll have to use the -b+- sqrt equation right?

Answer 10

Yep, this to be exact
\[x=\frac{-b \pm \sqrt{b^2-4ac}}{2a}\]

Answer 11

Where a=1, b=3, c=25

Answer 12

y = -b+- sqrt_/ b^2 - 4ac/2a
y = -3 +- sqrt_/3^2 - 4*1*25 / 2*1
y = -3 +- sqrt_/ 9 - 4*25 / 2
y = -3 +- sqrt_/ 9-100 / 2
y = -3 +- sqrt/ -46

so like this?

Answer 13

-3 +/- sqrt (9 - 4*25)
= -3 +/- sqrt (-91)

Answer 14

- oh all that divided by 2 !!!

Answer 15

are you familiar with imaginary numbers? sqrt(-1) = i ?

Answer 16

sooo I find the square root of -91 and then divide it by 2?

Answer 17

you divide it all by 2

-3 +/- sqrt91 i
------------
2

Answer 18

oh ok

Answer 19

i is the symbol for sqrt (-1)

Answer 20

the roots consist of 2 complex numbers
a complex number has a real and an imaginary part

Answer 21

we can write them as