Would any math Guru's be kind enough to check my Algebra homework for me? It's easy!?

Question

I haven't done this in like, forever, so I'm not sure if I'm even doing this right.

Even if you just check a few, that would be great =) Although I'll give the best answer to the person who helps me the most. Thanks so much!

Evaluate. X=5 and Y= -3

1.-2x^2 = -100?

2.-y+x =8?

3.-xy=15?

4.(x+5y)/x =-6

5. x-y*x= -10

6.2(1-x)/y-x =-10

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Algebra Simplify

1.6x-4x+8-5 = 2x+3

2. 2(L+W)= 2L +2W

3. (r-1)^2 = r-1^2

4.2T^2+4T-5T^2=7^4 +4

Answer 1

X1. -2x^2= -50

  2.right

   3.right

X4. (x+5y)/x=(5+5(-3))/ -5= (5+-15)/-5= -10/-5=  2

X5.x-y*x=5-(-3)*5=5-(-15)=5+15=20

X6.2(1-5)/(-3-5)=1

1. right

2. right

X3.(r-1)^2= r^2- 1^2= r^2-1

X4.   4T-5T^2

Answer 2

1. No, x^2 is evaluated first, so the answer is -2(25) = -50

2. Correct

3. Correct

4. No, (x+5y) = (5 - 15) = -10.  -10/x = -2

5. No, 5 - (-3*5) = 5 -- 15 = 5+15 = 20.

6. As you wrote it...

2(1-x) = -8...   -8/y = 8/3.  8/3 - x = 8/3 - 15/x = -7/3

if it is like below  then = -8 / (-8) = 1.

2(1-x)  

----------

y-x

Algebra Simplify:

1. Correct

2. 2(L+W) is already simplified, but it does equal 2L+2W

3. (r-1)^2 = r^2 - 2r + 1

4. 2T^2 + 4T - 5T^2 = -3T^2 + 4T = T(-3T+4)

This is the best I could do considering that I cannot see exactly how the problems were written.  Best of luck to you.

Answer 3

1) -2 (5)^2 = -2 * 25 = -50

2) correct

3) correct

4)  (5 + -15) / 5 = (-10) / 5 = -2

5) x - xy = 5 - (5)(-3) = 5 + 15 = 20

Sorry if i misread this problem.

6) 2(-4) / (-3-5) = -8 / -8 = 1

1) correct

2) correct

3) (r-1)(r-1) = r^2 - 2r + 1

Remember FOIL

4) 2t^2 + 4t - 5t^2 = -3t^2 + 4t

Add like terms

Answer 4

1. -2*(5^5) = -2(25) = -100

2. -(-3) + 5 = 3+5 = 8

3. -(5)*(-3) = 5*3 = 15

4. [5 + (5*(-3))]/5 = (5-15)/5 = 10/5  -2  <--!!

5. 5 - (-3)*5 = 5 +15 = 20 <--!!

6. 2(1-5)/(-3-5) = 2(-4/-8) = 2*(1/2) = 1 <--!!

1. (6x - 4x) +(8 - 5) = 2x +3

2. 2(:+W) = 2L +2W  <- although I'm not sure that's actually considered simplifying

3. (r-1)^2 = (r^2) - 2r +1 <--  (!!) still not technically simplifying, but...

4. 2(t^2) + 4t -5(t^2) = (2-5)*(t^2) + 4t = -3(t^2) + 4t <--!!

You did pretty well on the first few; I just marked the wrong answers with (!!)s. Have fun getting back into the swing of school!

Answer 5

PROBLEM 1:

Exponent takes precedence:

-2(5²)

= -2(25)

= -50

PROBLEM 2:

Correct

PROBLEM 3:

Correct

PROBLEM 4:

(5 + 5(-3)) / 5

= (5 + (-15)) / 5

= (-10) / 5

= -2

PROBLEM 5:

Multiplication takes precedence:

5 - ((-3) * 5)

= 5 - (-15)

= 5 + 15

= 20

PROBLEM 6:

Depends on whether the y-x is in the denominator:

2(1-x) / (y - x)

= 2(1 - 5) / (-3 - 5)

= 2(4) / (-8)

= 8 / -8

= -1

PROBLEM 1 & 2:

Correct:

PROBLEM 3:

(r - 1)²

= (r - 1)(r - 1)

= (r² - r - r + 1)

= r² - 2r + 1

PROBLEM 4:

2T² + 4T - 5T²

= -3T² + 4T

= T(-3T + 4)