algebra please help, best answer gets 10 points !?

2009-05-15 4:19 pm
Solve: 3(2x - 6) = -4(x - 3)

a. 6
b. 0.6
c. 3
d. 1.8

Multiply and simplify: (x + 8)(x + 3)

a. x^+24
b. x^+24x+11
c. 2x+11
d. x^+11x+24

回答 (8)

2009-05-15 4:24 pm
✔ 最佳答案
6x-18=-4x+12
10x-18=12
10x=30
x=3
answer is c,

(x+8)(x+3)
x^+3x+8x+24
x^+11x+24
answer is d,

:) xx
2009-05-15 4:59 pm
1)
3(2x - 6) = -4(x - 3)
3*2x - 3*6 = -4*x + 4*3
6x - 18 = -4x + 12
6x + 4x = 18 + 12
10x = 30
x = 30/10
x = 3
(answer c)

2)
(x + 8)(x + 3)
= x*x + 8*x + x*3 + 8*3
= x^2 + 8x + 3x + 24
= x^2 + 11x + 24
(answer d)
2009-05-15 4:33 pm
so you do distributive property( means you multiple everything in the parenthasisi by whats outside them giving you 6x-18=4x+12
then you subtract 4x froboth sides giving you 2x-18=+12
then you add 18 to both sides giving you 2x=6
then youdivide both sides by 2 giving you x=3

ok for the second one you use the methof FOIL which stands for first inner outer last thats the order in hich you multiply.
so first multiply the 2 first number x and x giving you x^2
then multiply the two outer numbers x and 3 giving you 3x
so far we have x^2+3x
then you multiply the twoinner numbers x and 8 giving you 8x
now we have x^2+3x+8x
now multiply the 2 last numbers 8 and 3 giving you 24.
just put it together and combine like tierms gotta go fast sorry
2009-05-15 4:31 pm
3(2x - 6) = -4(x - 3) -use distrubution law
6x - 18 = -4x +12
6x = -4x + 30
6x + 4x = 30
10x = 30
x = 3 (ans C)

(x + 8)(x + 3) -use FOIL method (first outer inner last)
x^2 + 3x +8x +24
x^2 + 11x +24 (ans D)
2009-05-15 4:29 pm
1. c.3 answer//
2. d.x^2+11x+24 answer//
2009-05-15 4:27 pm
yeah, c and d are the answers

3(2x-6)=6x-18
-4(x-3)=-4x+12
so 10x=30, or x=3

just look at the constant term 8*3=24
there is only one answer with 24 as the constant
2009-05-15 4:25 pm
1. 3(2x - 6) = -4(x - 3)
= 6x - 18 = -4x + 12
= 6x + 4x = 12 + 18
= 10x = 30
= x = 3
(c)

2. (x + 8)(x+3)
x² + 3x +8x + 24
x² + 11x + 24
(d)
2009-05-15 4:24 pm
c. 3

d. x^+11x+24


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