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Colt1911 [192]
3 years ago
8

20x -10x to the second power + 5x to the third power . In descending order

Mathematics
1 answer:
mario62 [17]3 years ago
7 0
It'd be best if you'd stick to symbols.  My interpretation of what you've typed here is 20x - 20x^2 + 5x^3.  In descending order by powers of x, that gives us

5x^3 - 20x^2 + 20x.
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The equation 12x² + 4kx + 3 = 0 has real and equal roots, if
sleet_krkn [62]

Answer:

k=\pm3

Step-by-step explanation:

[...] if you can write the LHS as a perfect square, or if you can't spot a factorization of it right away, if and only if the discriminant \Delta = b^2-4ac (or, if b is an even number, 1/4 of it) is zero.

<u>I see it! I see it!</u>

Stare at it for a while. First term is 3(2x)^2, third term is 3(1)^2, we are missing a double product, but we can play with k. For the LHS to be 3(2x\pm1)^2 = 3(4x^2\pm4x+1) = 12x^2\pm12x+3 you just need 4k= \pm12 \rightarrow k=\pm3.

<u>I don't see it...</u>

Then number crunching it is. Set the discriminant to 0, solve for k

\frac{\Delta}4 = 4k^2-12\cdot 3 =0 \rightarrow 4k^2=36 \\k^2 = 9 \rightarrow k=\pm3

8 0
2 years ago
Help on this too pls
kenny6666 [7]
<h3>$330</h3>

Step-by-step explanation:

Half of 40 is 20 and luckily they already gave us how much she would earn if she worked 20 hours.

So all we have to do is multiply the amount of money she earned when she worked 20 hours by 2 to see how much she earned when she worked 40 hours.

20 hours:165 dollars or 20:165

20 x 2= 40 and 165x2=330

So if Monique worked 40 hours she would earn $330.

5 0
2 years ago
Read 2 more answers
What is the area of a circle with a radius of 4cm
Degger [83]
50.27cm is the answer.
6 0
3 years ago
Read 2 more answers
The perimeter P of a triangle is equal to the sum of the lengths of sides a, b, and c.
SVETLANKA909090 [29]

Answer:

The sentence is true.

Step-by-step explanation:

Hope this helps you. Please mark as brainliest. It helps a lot. ^_^

6 0
3 years ago
Consider Frank's math test scores for the semester. Find the interquartile range of the scores.
musickatia [10]
Okay so you put the numbers in order:
70, 74, 81, 82, 83, 91, 94.

Then you find the median which will be Q2:
82.

Once you have the total median, you find the midpoint of the first and last part:
70, 74, 81. Midpoint/Q1=74
83, 91, 94. Midpoint/Q3=91

Now that you have that, you subtract Q3 and Q1.
91-74=17

17 is your IQR.
4 0
3 years ago
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