Question

Solve the equation by using the Square Root Property.

x^2 = 21 - 4x

Answer 1

do you know how to complete the square ?

Answer 2

no

Answer 3

x^2+4x = 21
here, the co-efficient of 'x' is 4
so, divide it by 2, and take its square, what u get ?

Answer 4

4/2=2 square root is 1.4

Answer 5

we need to SQUARE the result
so, 2^2 = 4
now, we add this on both sides.,
x^2+4x+4 = 21+4 = 25
got this ??
notice something about left side ?

Answer 6

u added 4????

Answer 7

yes, i added the result (here, we got 4) to both sides
now notice that left side is a perfect square! isn't it ?

Answer 8

yes

Answer 9

x^2+4x+4 is square of what ?

Answer 10

2

Answer 11

4 is the square of 2
x^2+4x+4 will be square of \(\large (x+2) \\ (x+2)^2 =x^2+4x+4\)
so we have
\((x+2)^2=25\)
take square root of both sides , what u get ?

Answer 12

x+1.4=5

Answer 13

x+2=5 my b

Answer 14

yes..
just put +/- in front of 5
x+2=5 or x+2=-5

Answer 15

can you solve those 2 easy equations ?
x+2= 5....x =.. ?
x+2=-5, ....x=....?

Answer 16

x=3 anx =-7

Answer 17

correct! good work :)

Answer 18

JAZZY ITS BRONX

Answer 19

hi what happenedy u not on ur regulrs account

Answer 20

Solve the equation by factoring:

x2 = 18 - 3x

Answer 21

Does x2 = x^2
And does the = sign suppose to be a + sign?

Answer 22

sorry im still waking up
x^2=18-3x

Answer 23

I don't think you can factor that.

Answer 24

sorry @hartnn i fell asleep i was up all night literally i didnt geta ounce of sleep until after w finished the problem we just finished

Answer 25

\(x^2+3x-18=0\)
can you tell me 2 numbers with sum = 3 and product = -18 ?

Answer 26

6 and -3

Answer 27

get some rest then! you can continue in the morning ?
yes! 6 and -3 are correct :)

Answer 28

it is morning hear its 8:30 am

Answer 29

so, split up, 3x = 6x-3x
\(x^2+6x-3x-18=0\)
factor out x from 1st 2 terms and -3 from last 2.....can you ?

Answer 30

(x+6)-(x-3) i think

Answer 31

there's no - *minus* sign
\((x+6)(x-3)=0\)
is correct final answer! good :)

Answer 32

oh yeah im sorry yall

Answer 33

and since you need to solve
find x from x+6=0 and x-3=0

Answer 34

-6 andd 3

Answer 35

\(\large \checkmark \)

Answer 36

thank you 5 more and im going to sleep

Answer 37

ok! how about asking new question in new post? :)

Answer 38

i did