Question 543362: Are any of these wrong? I've done the work, I would just like to know which ones are wrong please and thank you.
1. Simplify the following expression, and rewrite it in an equivalent form with positive exponents.
Answer: x^7 over y^5
2. Raise the quantity in parentheses to the indicated exponent, and simplify the resulting expression.
(-5x3y)2
Answer: 25x6y2
3. Short Answer: Simplify the following expression, and rewrite it in an equivalent form with positive exponents.(4x-2)-2
Solving: 4x*-2= -8x and -2*-2=4
Answer: -8x+4
4. Multiply the expressions, and simplify.
(x-2y3) • (2x4y-2)
Answer:2x-6y5
5. Short Answer: Convert this number to scientific notation:
64,000,000
Solving: 64,000,000 divided by 10^7= 6.4
Answer: 6.4*10^7
6. Use scientific notation to divide the following two numbers. Express the answer using scientific notation; retain at least three decimal places.
(8.7 • 109) / (3.22 • 102)
Solving:(8.7/3.22)*10^7
Answer: 2.701* 10^7
7. Add the complex expressions, and simplify.
(-10 + 3.1i) + (-6.2 + 2.5i)
-16.2 + 5.6i
-10.6i
-21.8
-10.6
8. Short Answer: Simplify the following expression; express in terms of i.√ -36
Solving: i√-36= i(6)=6i
Answer: 6i
9. Simplify the following expression.√ -90√ -15
Solving: -15* -15* -15* -15* -15* -15=90
Answer: -15√6
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! 1. Simplify the following expression, and rewrite it in an equivalent form with positive exponents.
Answer: x^7 over y^5 = y^2
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2. Raise the quantity in parentheses to the indicated exponent, and simplify the resulting expression.
(-5x3y)2
Answer: 25x6y2
Correct
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3. Short Answer: Simplify the following expression, and rewrite it in an equivalent form with positive exponents.(4x-2)-2
Solving: 4x*-2= -8x and -2*-2=4
Answer: -8x+4
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Are you sure the -2 is not an exponent?
Maybe your problem is (4x-2)^(-2) = 1/(4x-2)^2 = 1/(16x^2+16x+4)
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4. Multiply the expressions, and simplify.
(x-2y3) • (2x4y-2)
Answer:2x-6y5
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If those "-2's" are not exponents you should be using FOIL.
If they are exponents you have the wrong answer.
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5. Short Answer: Convert this number to scientific notation:
64,000,000
Solving: 64,000,000 divided by 10^7= 6.4
Answer: 6.4*10^7
Correct
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6. Use scientific notation to divide the following two numbers. Express the answer using scientific notation; retain at least three decimal places.
(8.7 • 10^9) / (3.22 • 10^2)
Solving:(8.7/3.22)*10^7
Answer: 2.702* 10^7
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Correct
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7. Add the complex expressions, and simplify.
(-10 + 3.1i) + (-6.2 + 2.5i)
Answer: -16.2 + 5.6i
Correct
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8. Short Answer: Simplify the following expression; express in terms of i.√ -36
Solving: i√-36= i(6)=6i
Answer: 6i
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No: (i)(sqrt(-36)) = i*6i = -6
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9. Simplify the following expression.√ -90√ -15
Solving: -15* -15* -15* -15* -15* -15=90
Answer: -15√6
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I don't understand your "solving" but the answer is correct.
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Cheers,
Stan H.
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