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Neko [114]
3 years ago
5

Solve for x? 3x^2-6x-2=4+5x-7x^2

Mathematics
2 answers:
wariber [46]3 years ago
6 0
Answer: -2/5 or 3/2
hodyreva [135]3 years ago
3 0

Answer:

3/2 or -2/5

Step-by-step explanation:

Get everything on one side because this is a quadratic....

subtract 4 on both sides

subtract 5x on both sides

add 7x^2 on both sides

this gives us:

10x^2-11x-6=0

Now we can try to factor or just hop right into the quadratic formula

D=b^2-4ac=121-4(10)(-6)=121+240=361

sqrt(D)=sqrt(b^2-4ac)=19 where this is the sqrt(discriminant) so it would have factored nicely since this come out to be a whole number.

Anyways the quadratic formula says to do x=(-b (pm) sqrt(D))/(2a)

*(pm) means plus or minus*

So x=(11 (pm) 19)/(20)

So x=30/20=3/2 or -8/20=-2/5

(do you want to show factored form and do it that way)

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6 times what is 36 <br> please answer in a correct fashion
atroni [7]

Answer:

6

Step-by-step explanation:

36/6=6

Hope this helps <3

8 0
3 years ago
Read 2 more answers
Can someone help asap please
Zanzabum
Part A
If 2 inches is 25 miles, then you can set up a ratio to find how many inches 60 miles is.
2 inches equaling 25 miles would be 2:25 in a ratio form of inches:miles.
If miles equals 60, then the ratio would be x:60 in inches:miles.
Since both sides must have the same thing done to them, divide 60 by 25 to see how much miles was multiplied by to get to 60, then multiply inches by that to get x.
60 / 25 = 2.4
2 • 2.4 = 4.8
So the answer to part A is 4.8 inches represent 60 miles.

Part B
You can do the same concept for Part B.
1/4 = 0.25
In a ratio of inches:miles, this would be 0.25:x
Since the original ratio is 2:25, you must figure out how many times 1/4 goes into 2.
2 = 2/1 = 4/2 = 8/4
So 1/4 goes into 2, which can be represented by 8/4, 8 times.
This means 2 was divided by 8 to get 0.25.
Now divide 25 by 8 to get x.
25 / 8 = 3.125
So the answer to part B is 3.125 miles are represented by 1/4 inch.
7 0
4 years ago
Please hurry, I'm doing an Exam!!
Sveta_85 [38]

Answer:

14 to 8 I think

Step-by-step explanation:

Not too sure but looked on my old ratios sheet and there's 80:140 so that could be right but honestly none of these look right, I attached the photo of what my teacher told us to use last year to check answers

6 0
3 years ago
Read 2 more answers
Is the equation x9 – 5x3 + 6 = 0 quadratic in form? Explain why or why not.
hichkok12 [17]
The given equation, x9 - 5x3 + 6 = 0, is not a quadratic equation because the exponent of the first term is 9 while that of the second term is 3. The square of 3. If we are to square x3, we should only be getting x6 instead of x9. Therefore, the answer is NO. 
5 0
3 years ago
Read 2 more answers
(4,7), (x,19); slope = 3 the pair points lies on the same line with the given slope. Find x
Andrew [12]
So we are given two points, say P1(4,7), P2(x,19).

Slope is given by 
m=3=(y2-y1)/(x2-x1)=(19-7)/(x-4)
solve for x
3=(19-7)/(x-4)
cross multiply
3(x-4)=12
3x-12=12
3x=12+12=24
x=8

3 0
4 years ago
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