Q1: Select the choice below that represents the following polynomial in descending order: 8-2^8-x^9-5X^4
it is -x^9 -2x^ 8 - 5x^4 +8 right?
Q2: Which of the following is the prime factorization of 100?
a) 2^2 x 5^2
b) 2 X 5
c) 4 x 25
d) (2^2 x 5^2)^2
ans would be A?
Q3: Solve: -8x^2 = 40x
a) {-5,5}
b) {-5,0,5}
c) {0,-5}
d) {0,5}
Q4: Find the GCF of 8xy and 32x^3y
a) 8
b) 8xy
c) 16xy
d) 32x^3y
algebra homework help, please?
2008-08-14 8:16 am
回答 (3)
2008-08-14 10:50 am
✔ 最佳答案
1)8 - 2x^8 - x^9 - 5x^4
= -x^9 - 2x^8 - 5x^4 + 8 (in descending order)
= = = = = = = =
2)
100 = 2^2 x 5^2
(answer a)
= = = = = = = =
3)
-8x^2 = 40x
-8x^2 - 40x = 0
(-8x^2 - 40x)/-8 = 0/-8
x^2 + 5x = 0
x(x + 5) = 0
x = 0
x + 5 = 0
x = -5
∴ x = -5 , 0
(answer c)
= = = = = = = =
4)
8xy = 2^3 * x * y
32x^3y = 2^5 * x^3 * y
----------------------------
The GCF of 8xy , 32x^3y is:
2^3 * x * y
= 8xy
(answer b)
2008-08-14 8:25 am
1) You answered correctly
2) You answered correctly
3) -8x^2 = 40x
Divide both sides by 8
-x^2 = 5x
Or, x^2 = -5x
Or, x^2 + 5x = 0
Or, x(x + 5) = 0
Or, x = 0, x + 5=0
Or, x = 0,-5
Ans: (c)
4) GCF is 8xy because 8xy divides 32x^3y
32x^3y/8xy = 4x^2
Ans: (b)
2) You answered correctly
3) -8x^2 = 40x
Divide both sides by 8
-x^2 = 5x
Or, x^2 = -5x
Or, x^2 + 5x = 0
Or, x(x + 5) = 0
Or, x = 0, x + 5=0
Or, x = 0,-5
Ans: (c)
4) GCF is 8xy because 8xy divides 32x^3y
32x^3y/8xy = 4x^2
Ans: (b)
2008-08-14 8:25 am
Wow is algebra really that hard? Do your teachers suck or did you fall asleep in class. Because both of that happened to me and I still had a relatively easy time.
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