Question

r^2-22r+21=0
How am I suppose to start this off? Kinda having a brain lag at this time of night

Answer 1

you have several ways to solve it
1) grouping method
2)by completing square
3) by using direct formula
which one you like

Answer 2

grouping

Answer 3

ok

Answer 4

let me try that

Answer 5

ok try it

Answer 6

by grouping it may not be possible i think

Answer 7

it possible

Answer 8

im trying

Answer 9

yeah thats not working out

Answer 10

can i do it for you??

Answer 11

if I group i get

Answer 12

yaaa please do it

Answer 13

ok see

Answer 14

r^2-1r-21r+21 Is this correct?

Answer 15

r^2-22r+21=0
r^2-21r-r+21=0
r(r-21)-1(r-21)=0
(r-1)(r-21)=0
=> r = 1 or r = 21

Answer 16

yaaa its possible

Answer 17

great job

Answer 18

Damn good job!

Answer 19

So therefore the sol set is 1 & 21?

Answer 20

exactly

Answer 21

great

Answer 22

What it an easier way of figuring this equation out without using the quadratic formula? z^2+5z=-6

Answer 23

I got it!

Answer 24

oooooooooooooooooooook

Answer 25

z=-3,-2

Answer 26

yessssss

Answer 27

awesome!

Answer 28

you are good at maths. good try

Answer 29

Thanks Im trying

Answer 30

you are welcome

Answer 31

s^2=9
I got 3,-3

Answer 32

yes thats right

Answer 33

good deal

Answer 34

How should I start this one off?
3b^2=9b

Answer 35

ok divide both sides by b first

Answer 36

k

Answer 37

b=3?

Answer 38

yap

Answer 39

But its asking for the solutions sets?

Answer 40

ok ok bring that 9b to LHS what you get

Answer 41

hold on

Answer 42

9b-3b^2=0??

Answer 43

its 3b^2-9b = 0
take 3b common what you get???

Answer 44

take 3b^2 huh?

Answer 45

3b(b-3)

Answer 46

yessss

Answer 47

3b=0 and b-3=0

Answer 48

thats right so what you get for b???

Answer 49

0,3

Answer 50

thats right

Answer 51

sweet! Thanks

Answer 52

ok for me its prayer time see you soon

Answer 53

you are welcome

Answer 54

K