Question

Can someone please explain and show me how to do these please. 1.) x^2 – 8x + 15
2.) a^2 – a – 20
3.)a^2 – 5a – 20
4.)a^2 + 12ab + 27b^2
5.)2a^2 + 30a + 100

Answer 1

@Roya Could you help me?

Answer 2

Anyone?

Answer 3

all of 'em?

Answer 4

dear i 'll . u need to find out x and a ?

Answer 5

Yes please. Well, yeah. :/
It's factoring trinomials.

Answer 6

Instructions say --> Factor each trinomial below. Please show your work

Answer 7

x^2-8x+15=0
(x-3)(x-5)

Answer 8

for ex for this one think about two numbers which their multiple product be 15 and their product of sum be -8

Answer 9

we know that 3*5 is 15
and we check if the some of them is -8 or not ?
5+3=8
but with a little experience we guess -3+-5=-8

Answer 10

I see.

Answer 11

20=10*2
10*2=8
10-2=8
20=5*4
5+4=9
5-4=1
4-5=-1
so can u find out the factors ?

Answer 12

10 and 5

Answer 13

u mean (a-10)(a-5) ?

Answer 14

Wait, which one are we on?

Answer 15

The second one?

Answer 16

second

Answer 17

I'd say the factors would be -10 and -5.

Answer 18

look at what i wrote before .
4-5=-1
4*-5=-20

Answer 19

(a-1) (a-10)

Answer 20

not -10 I meant a-1 * a-20

Answer 21

a^2-11a+10 is it ur equation ?

Answer 22

a^2-21a+20 is it ur equation

Answer 23

So confusing. :/

Answer 24

don't be confuse it's need just practice .
look at what i done

Answer 25

for second one as i wrote before the answer is :
a-5*a+4

Answer 26

ok..

Answer 27

i think the third one is not correct but let's check forth one :

Answer 28

The question for #2 is, a^2 – a – 20. So, I have to find the product of -a and the sum of -20, right?

Answer 29

All those up top are questions, I have to factor all of them.

Answer 30

u know (a+b)^2= a^2+2ab+b^2
can u guess what we should put in my equation instead b ?
because u see that first term didn't change

Answer 31

ok i solve num 3 as well but first the easier

Answer 32

Let's do #2, again.

Answer 33

a^2 – a – 20

Answer 34

ok

Answer 35

What would I do first?

Answer 36

for factories as i remember we have some ways can u tell me the ways ?

Answer 37

Find the product of one and the sum of another.

Answer 38

plz tell me all the method

Answer 39

I don't know..

Answer 40

one is (x+b)(x+a)=x^2+(a+b)+ab
that's what u mentioned .

Answer 41

fortunately we can solve #2 with this :
so look at 20
tell me product of which numbers make 20?

Answer 42

10*2

Answer 43

and 1- - 2 = 8

Answer 44

10 - 2 = 8

Answer 45

so 10 and 8?

Answer 46

look at our formula
coefficient of x is equal to sum of the numbers , am i correct ?

Answer 47

Yse.

Answer 48

ok now tell me is the sum of 10 and 2 equal to -1 ?

Answer 49

10 + 2 = 12. 12 + (-13) = -1

Answer 50

dear now what's ur number ?
check them

Answer 51

The sum of 10 and 2 is 12, right?

Answer 52

yes

Answer 53

Okay, so the sum of 10 and 2 isn't -1.

Answer 54

....

Answer 55

dear don't be confuse . may i know what's ur grade ? high school ?

Answer 56

9th.

Answer 57

where r u from ?

Answer 58

I just need to complete these 5 questions for my assignment or I get kicked out of my class. I'm from USA.

Answer 59

dear i'm here till tomorrow morning and i'll help u .
u r just 16 years old . never mind dear no one kick u out

Answer 60

lets learn it again with each other ok ?
ready ?
fasten ur seat belt

Answer 61

I'm 17. I've failed Algebra 3 times. I just don't understand it. I'd be graduated by now if it wasn't for Algebra.

Answer 62

u r a genius . may i know ur name ?

Answer 63

Possibly. What's yours?

Answer 64

dear algebra is sweet if u touch it and guess it .

Answer 65

my name is roya . i'm iranian and i'm 21 . i'm electrical engineering student and mu=y name means dream . any thing else ? i'm a girl

Answer 66

Ha. I'm a boy, 17 the name is Dylan and I'm from Florida.

Answer 67

ok are u ready ?

Answer 68

My name is Careless because eeveryone calls me that and I don't care about anything but computers and programming and processing. Yes, I'm ready. Let's start with #2... again. please.

Answer 69

dear look at # 2 . and compare it with our formula
a^2-a-20

Answer 70

our formula for this one is
x^2+(a+b)x+ab

Answer 71

ok..

Answer 72

so we should find 2 numbers which their mlt = -20 and their sum = -1
ok ?

Answer 73

mlt=multiple

Answer 74

ok.

Answer 75

so tell me the numbers which their mlt = -20

Answer 76

-10 * 2

Answer 77

can u tell me their sum ?

Answer 78

sum of...?

Answer 79

-10 + 2?

Answer 80

as u and me know their sum is 10-2 =8
ok ?

Answer 81

or as u wrote -10+2=-8

Answer 82

ok..

Answer 83

none of them are equal to -1 . am i right ?

Answer 84

Right.

Answer 85

so let's try another numbers . tell me two other number's which mlt=-20

Answer 86

-5*4

Answer 87

ok and tell me the sum

Answer 88

-5 + 4 = -1///

Answer 89

(x-5) (x+4) .... ^_^

Answer 90

so u find two numbers which mlt=-20 and sum = -1
so put them in our formula

Answer 91

such a genius boy . u should proud of urself .

Answer 92

know multiple two terms to check ur answer .

Answer 93

So, I got it right?

Answer 94

ok i give u another ex and plz solve it for me .

Answer 95

x^2+5x+6

Answer 96

ok...

Answer 97

mlt of 5 and sum of 6.. is....

Answer 98

oh oh ! mlt=6 sum=5