Question

Solve the equation using the quadratic formula.

x^2 + 10x = -25

Answer 1

ok so do u know the quadratic formula

Answer 2

I know the quadratic formula... for ax^2 + bx + c = 0,

\[x = \frac{ -b \pm \sqrt{b ^{2}}-4ac }{ 2a }\]

Answer 3

Whoops. Sqrt the -4ac too though.

Answer 4

ok so u would plug 1x for a 10x for b and 25 for c cause u have to equal it to 0

Answer 5

first step is making it ax^2+bx+c=0

Answer 6

if its -b+ and - u put (-10)

Answer 7

no. its not a dumb question

Answer 8

Sorry, I saw you say 25 in place of c just now. I have /really/ bad number memory. And thank you. So is this it?

\[\frac{ -10 \pm \sqrt{10^{2}-4(25)} }{ 2 }\]

Since a is just 1

Answer 9

yea so u would multiply -4 times 25 and 10^2

Answer 10

so 100 - what ever u got when u multiplied

Answer 11

u confused?

Answer 12

No, sorry! -4*25 is -100, so it's 100 - (-100) / 100 + 100= 200, yeah?

Answer 13

ok so its actually 100-100 becuase u dont need to have the (-100) in parentheses

Answer 14

Ah, alright

Answer 15

so square root of 0 is 0 and -10+the square root of 0 is -10/2

Answer 16

and the do -10-the square root of 0 and divide by 2

Answer 17

So x = -5?

Answer 18

and x= also another number

Answer 19

The only answer options are all one number, plus -10+0 and -10-0 would bring about the same results.

Answer 20

true hold on let me do the problem on paper. i did this in my head and think i messed up

Answer 21

Alright, no problem.

Answer 22

ok so i got -5

Answer 23

Ok! Plugging it into the original equation gets the right answer anyways, so I'm pretty confident that's correct. Thanks for your help!

Answer 24

u welcome @ me if u need anymore help

Answer 25

Will do!