Question

graph of

squareroot x

Answer 1

why geogebra is showing only positive portion ?

Answer 2

what is the square root of -1?

Answer 3

oh i didnt mean x,

Answer 4

y, sqrt(16) = + or - 4

Answer 5

i expected to see parabola stretching across x axis ?

Answer 6

oh, because it acts like a instant calculator
1 input 1 output

Answer 7

and the output for square roots is always positive, computer wise

Answer 8

oh ok.. im trying to find range by graphing, then geogebra is misleading

Answer 9

range is y axis right?
if so then yes

Answer 10

ok so range is all R for radical x

Answer 11

?

Answer 12

i think so?

Answer 13

ok thanks i thought so but when i graphed geogebra i confuse :S

Answer 14

yea, the same thing happens if you try to draw a circle

on graphing calculators, it usually just defaults to positive answers
and cant calculate double outputs

Answer 15

yeah that makes sense i guess but geogebra is drawing a circle for x^2+y^2=4
anyways i get it should not trust geogebra blindly

Answer 16

graphing calculator-wise
y= sqrt(4-x^2)

Answer 17

yeah it gives semicircle now lol

Answer 18

its getting confuse wid square root is it

Answer 19

im not sure :\

Answer 20

you're absolutely correct that the square root equals +/-
the problem lies with the computer
one imput = one output
one x value = one y value

if it was one x value= two y values
one of the y values will overwrite the other
and then become one x value one y value

to avoid confusion, the answer of square roots just comes out to positive numbers

Answer 21

if it really bugs you that much, you could always just write another equation but with a negative sign infront of it to invert the graph

Answer 22

that makes sense

but to be frank, im still confuse i dont think i understand range of radical x, still

y = +radical (x)
y = -radical (x)
y = radical (x)

all give same range is it

Answer 23

nvm got it... :)

Answer 24

i think its related to vertical line test

Answer 25

i dont get it completely though...

this site explaines the same

http://msenux.redwoods.edu/IntAlgText/chapter9/section1.pdf

Answer 26

could you/someone help me understand pls

Answer 27

@dpaInc

Answer 28

@lgbasallote @UnkleRhaukus

Answer 29

graph x=y2

Answer 30

good