Question

NEED HELP ASAP PLEASE:
Solve x^2 + 8x − 3 = 0 using the completing-the-square method.

x = four plus or minus the square root of three
x = negative four plus or minus the square root of three
x = four plus or minus the square root of nineteen
x = negative four plus or minus the square root of nineteen

Answer 1

@pooja195 @Nnesha

Answer 2

complete the square is:
turn this \(\large ax^2 + bx + c = 0\)

into this \(\large a(x+d)2 + e = 0\)

remember:

\(\Large d = \frac b{2a} \)

\(\Large e = c - \frac{b^2}{4a}\)

Answer 3

so it would be C right???

Answer 4

your equation is:
\(\large x^2 + 8x + (-3) = 0\)

so turn it into this: \(\large a(x+d)2 + e = 0\)

by first solving:

\(\Large d = \frac b{2a} =???\)

\(\Large e = c - \frac{b^2}{4a} = ??? \)

Answer 5

ok, and i go C

Answer 6

correct, C

Answer 7

it is really? i did it right?:-D

Answer 8

yep

Answer 9

tjanks!

Answer 10

np

Answer 11

could you help with one more? @Jack1

Answer 12

wait... neg 4
negative 4!
dammit, sorrt
D
not C

Answer 13

*sorry ;(

Answer 14

aww ok:-( thanks again! can i ask you one more

Answer 15

sure

Answer 16

Using the completing-the-square method, find the vertex of the function f(x) = –2x^2 + 12x + 5 and indicate whether it is a minimum or a maximum and at what point.

Maximum at (–3, 5)
Minimum at (–3, 5)
Maximum at (3, 23)
Minimum at (3, 23)

Answer 17

ok, so have u completed the square?

Answer 18

yes

Answer 19

and ur equation is now...?

Answer 20

2x^2+35x?

Answer 21

no.
what are a, b and c in ur original equation?

Answer 22

X2 8 -2

Answer 23

no.

\(\large ax^2 + bx + c = 0\)
\(\large 2x^2 + 12x + 5 = 0\)

so a is 2
b is 12
c is 5... right?

Answer 24

u with me?

Answer 25

r u still there?

Answer 26

yes! sorry what now? @jack1