Question

I have a quadratic eq. question:
Which of the following is a solution of 2x2 = -3x - 5?
a. x = -3 -7i over 4
b. x = 3 + 7i over 4
c. x = 3 - i sqrt 31 over 4
d. x = -3 + i sqrt 31 over 4

Answer 1

here agin a=+2 b=+3 and c=+5

Answer 2

check if you get
d. x = -3 + i sqrt 31 over 4
after using quadratic formula..

Answer 3

so it got c. but it's because of the negative sign again

Answer 4

check if you get
d. x = -3 + i sqrt 31 over 4
after using quadratic formula

Answer 5

check the sign of b

Answer 6

you have to make the 3x and the 5 positive right!

Answer 7

no not that..

Answer 8

to get it in the form of the quadratic equation? with zero on the other side?

Answer 9

yup
2x2 = -3x - 5
2x2 + 3x + 5 =0 now you compare it with standard quadratic..

Answer 10

ok yes it get this now! you're a great teacher! then it's just factoring it out. the sqrt's upset me lol!

Answer 11

sometimes it can be factored other times not..

Answer 12

so you just simplify as much as possible and that's your answer?

Answer 13

thanks again I am beginning to understand..

Answer 14

yw

Answer 15

but for ax^2+bx+c = 0
x= (-b - sqrt(b^2 -4ac))/(2a) , (-b + sqrt(b^2 -4ac))/(2a)

Answer 16

oh cool, yes I can see now! I am putting that in my notes now. You are super!

Answer 17

yw