Question

Help please. Fan & medal
Pre calc

Answer 1

Solve: x^2 + 11x + 30 = 0
I used the quadratic formula= -b +/- √b^2 - 4ac/2a

Answer 2

I am working on it and got to -11 +/- √1/2 but im confused on how to go further

Answer 3

well can you simplify √1 ?

Answer 4

just 1?

Answer 5

yep, so you have

(-11 ±1)/2

Answer 6

this means (-11+1)/2 is one solution, and (-11-1)/2 is the other solution

Answer 7

Thats not an answer :(

Answer 8

so take each case separately and simplify

Answer 9

what does x = (-11+1)/2 simplify to ?

Answer 10

-5

Answer 11

good, so that is one of the solutions,

Answer 12

what about the other one

Answer 13

then the other is -6? :)

Answer 14

yes, you have found both solutions \[\color{red}{\checkmark\checkmark}\]

Answer 15

Awesome thanks, youre a great teacher :)

Answer 16

if you want to check you solutions just plug them in and see

x^2 + 11x + 30 = 0

plugging in x= -5

(-5)^2 + 11(-5) + 30 [this should equal zero ]


plugging in x= -6

(-6)^2 + 11(-6) + 30 [this should also equal zero ]

Answer 17

Okay cool :) thanks

Answer 18

If i need help on another one do you mind if i tag you in it later on to heLp?

Answer 19

(i actually have to go because the cafe im at is closing, )

i might be on later though , [feel free to tag me ]

Answer 20

Okay :) thanks for help again :D