Question

please I really need help factoring these
1.x2 – 8x + 15
2.a2 – a – 20
3.a2 – 5a – 20
4.a2 + 12ab + 27b2
5.2a2 + 30a + 100

Answer 1

well factoring look at the constant

in question 1

find the factors of 15 that add to -8, they are both negative.


2. find the factors of -20 that add to -1, the larger factor is negative and the smaller is positive


just keep looking at the factors of the constant

Answer 2

I t if someone could give me the awnsers then tell me how to do it from there it wouldhelp

Answer 3

well look at the 1st one

(x + factor 1)(x + factor 2)

what what are the factors of 15 that add to -8 if both factors are negative

what would you answer.

Answer 4

-3 -5

Answer 5

there is the 1st one done

(x -3)(x - 5)

now the next

factors of 20 that add to -1, the larger factor is negative...

what would you answer

Answer 6

4 -5

Answer 7

yep so its

(a - 5)(a + 4)

Answer 8

3. doesn't factor

4. look at 2 factors that multiply to 27 and to 12

5. take out 2 as a common factor

\[2(x^2 + 15x + 50)\]

then find 2 factors of 50 that add to 15.

Answer 9

for question 4 its

(a + factor1 b)(a + factor 2 b)

Answer 10

for #5 just x+5 and x+10

Answer 11

thats it

make sure you write them in brackets

Answer 12

hope this helped

Answer 13

and with question 5 write it as

2(x +5)(x +10)

Answer 14

ok thanks