Question

why is sqrt(2x+3)=x equal to x=3

Answer 1

\[\sqrt{2x+3}=x\]

Answer 2

@iambatman

Answer 3

love that name XD

Answer 4

square both side

Answer 5

yep i know that

Answer 6

but i don't know what i do afterwards

Answer 7

do i just subtract 3?

Answer 8

root will cancel due to square

Answer 9

i know that

Answer 10

2x+3=x^2

Answer 11

yep

Answer 12

i also know that XD

Answer 13

now subtract 3 from that

Answer 14

yep i said that

Answer 15

then do i move 2x over there as well?

Answer 16

but then how do i get x=3

Answer 17

2x=x^2-3
now subtract 2x from both side
0=x^2-2x-3

Answer 18

huh

Answer 19

then?

Answer 20

now what we need is to factorise it

Answer 21

ohhh

Answer 22

x^2-3x+x-3=0

Answer 23

wait what

Answer 24

can u do further ??? and tell me the ans

Answer 25

WHOAAAAAaaa

Answer 26

where did the extra x come from

Answer 27

its done to factor

Answer 28

:|

Answer 29

thats my clueless face

Answer 30

we have to break -2x such that sum = -2 and product =-3

Answer 31

u know how to factorise

Answer 32

yes, but i still don't understand where x came from

Answer 33

or is mandatory? like is it supposed to be there?

Answer 34

or is there a place where you drag it from?

Answer 35

leave it and you factorise first by your way..and forget abt that x

Answer 36

x^-2x-3=0

Answer 37

do its factor

Answer 38

BUT

Answer 39

ummm

Answer 40

uhh

Answer 41

huh

Answer 42

ok i give up

Answer 43

please explain your ways master

Answer 44

lolll not master ....u know wat we do to factor ???

Answer 45

see thats the problem

Answer 46

i completely just brain farted

Answer 47

i don't remember XD

Answer 48

x^2-2x-3=0
we factor the term with x

Answer 49

but there is no other x

Answer 50

The simplest answer for "why" is :
because when x =3, \(\sqrt {2x+3}= \sqrt {2*3+3}=\sqrt9=3\)

Answer 51

we factor 2 such way that sum of its factor =-2

Answer 52

whaaat

Answer 53

huh

Answer 54

BUT I NEED TO KNOW WHY THERe'S A X THERE

Answer 55

well @Loser66 there is no whyyy....u have to go by proper method

Answer 56

yeah, technically.

Answer 57

hahaha... the question is why, right?

Answer 58

I'm the visual type, so i HAVE to know why theres a x there

Answer 59

we factor the term with x such that ....sum of its factor =-2
and product = constant term which is =-3

Answer 60

so we use -2=-3+1

Answer 61

ok, if you need prove, here is
first off, you have to have 2x+3 >0,

Answer 62

sum=-3+1=-2
product=(-3)*1=-3

Answer 63

yeah...

Answer 64

x^2+(-3+1)x-3=0
x62-3x+x-3=0

Answer 65

That helps you reject x =-3 after all

Answer 66

sorry that is x^2 not x62

Answer 67

lol

Answer 68

now you got ??

Answer 69

WHERE DID X62 COME FROM!!!<<DWJFKHRI"W

Answer 70

somewhat :D

Answer 71

OH I REMEMBERED FROM MY BRAIN FART

Answer 72

RIGHTTT

Answer 73

man thatzz what i wrote
it is not x62 it is x^2

Answer 74

you have to find the pair that multiplies to 3, but adds up to -2

Answer 75

just go through carefuly wat i posted

Answer 76

RIGHTTTT

Answer 77

OH MY BRAIN FART JUST GOT REMOVED

Answer 78

multiply to -3 and add up to -2

Answer 79

OH PHEWWW

Answer 80

yeah that

Answer 81

lolll

Answer 82

well thanks :D

Answer 83

have a nice day or night XD

Answer 84

wlcm:)

Answer 85

hmmm night :P

Answer 86

:D