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olga2289 [7]
3 years ago
13

Factor this please: x^4-9x^2+20

Mathematics
2 answers:
Novosadov [1.4K]3 years ago
7 0
Your answer is (x+2)(x-2)(x^2-5)
vfiekz [6]3 years ago
4 0
<span><span> x = ± √<span>5 </span>= ± 2.2361</span> x = 2<span> x = -2</span></span>
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How to write 8.517 in word form
inysia [295]
<span>Answer:

8.517 in word form is eight and five hundred seventeen thousandths or eight</span>
3 0
3 years ago
9. A cup of tea costs x pence. Coffee costs 20 pence more. Hermes buys 2 cups of tea and one cup of coffee. In total Hermes pays
qaws [65]

Answer:

  • £1.20

Step-by-step explanation:

<u>Given:</u>

  • Tea = x
  • Coffee = x + 0.2

<u>Comparing the total cost, work out the value of x:</u>

  • 2x + x + 0.2 = 3.80
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5 0
2 years ago
The area of a rectangle is expressed as x4 - 9y2. What are the possible dimensions of the rectangle?
AnnyKZ [126]

This is a stupid question.  The teacher who asked this needs to go back to school.

A = x⁴ - 9y²

That's going to be a number.  As long as it's positive we can choose any length for our rectangle L and we can compute the width by W=A/L.   So the correct answer is the dimensions are L by  (x⁴ - 9y²)/L.

They don't want the correct answer.  They want you to factor this expression.  We'll do it, but don't believe for a second this factoring somehow constrains the possible dimensions of some rectangle.

We use the difference of two squares, a²-b² = (a+b)(a-b)

A = x⁴ - 9y² = (x²)² - (3y)² = (x²+3y)(x²-3y)

Answer: x²+3y  by  x²-3y

5 0
3 years ago
Represent the electricity bill using a linear equation in 2 variables with respect to fixed charge and unit consumption in the m
ruslelena [56]

Answer:

Step-by-step explanation:

If the kilowatt-hours stay proportional to the total bill, then you are using more electricity. If the bill goes up a lot more than the kilowatt-hours, then you are on some sort of "rate plan" that punishes peak usage

6 0
3 years ago
8 limes/$2.00 You have $5. How much change would you receive after purchasing 12 limes?​
olga nikolaevna [1]

Answer:

2 dollars

Step-by-step explanation:

if 8 limes costs 2 dollars, then 4 limes cost 1 dollar

you purchased 12 limes so since you already know what 8 limes coms, you could subtract that

12-8=4

now you need to find out how much for 4 limes which would be half the price of 8 limes.. which should be 1 dollar

so $2.00+$1.00= $3.00

finally 5 dollars minus 3 would result in a change of 2 dollars

3 0
3 years ago
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