okay, which one is NOT a common factor of 3n squared +9n-84:
a)3 b)n+7 c)n-4 d)n+4
second question
What factor is common to both x squared + 2x-15 and x squared + x -20:
a)x-5 b)x+5 c)x-4 d)x-3
THANK YOU SOOOO MUCH!
2007-03-15 09:49:44 · 5 answers · asked by Anonymous in Education & Reference ➔ Homework Help
For the first one:
2n^2 + 9n - 84
factor out 3: 3 (n^2 + 3n - 28)
factor: 3 (n-4)(n+7)
so n+4 is not a factor
For the second one:
x^2 + 2x - 15 = (x+5) (x-3)
x^2 + x - 20 = (x+5) (x-4)
they both have (x+5) in common
2007-03-15 09:57:15 · answer #1 · answered by tsihilin 3 · 0⤊ 0⤋
1) answer is d)n+4
3n-squred+9n-84 can be factored into:
(3)(n-squared+3n-28) or,
(3n-12)(n+7) or,
(3n+21)(n-4)
2) answer is b) x+5
x-squared+2x-15 factors into (x+5)(x-3)
x-squared+x-20 factors into (x+5)(x-4)
2007-03-15 10:40:26 · answer #2 · answered by kyle b 1 · 0⤊ 0⤋
#1 d
#2 b
2007-03-15 10:00:17 · answer #3 · answered by Tom B 3 · 0⤊ 1⤋
1) solve for 'n', solve the problem itself, then solve the answers, and see which factor in properly.
2) answer above, but using 'x'
2007-03-15 09:57:59 · answer #4 · answered by gilgamesh 6 · 0⤊ 0⤋
C,A
2007-03-15 10:20:59 · answer #5 · answered by Josue 5 · 0⤊ 0⤋