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Leviafan [203]
3 years ago
9

How do I solve -x^2+7x-3=0

Mathematics
1 answer:
poizon [28]3 years ago
6 0
-x^2+7x-3=0 multiply the expression by -1

x^2-7x+3=0  we will complete the square so subtract 3 from both sides

x^2-7x=-3  now halve the linear coefficient, -7/2, square it 49/4, and add that to both sides...

x^2-7x+49/4=49/4-3  now the left side is a perfect square...

(x-7/2)^2=(49-12)/3

(x-7/2)^2=37/3  take the square root of both sides...

x-7/2=±√(37/3)  now add 7/2 to both sides...

x=7/2±√(37/3)
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What is the volume of a cone with a radius of 6 cm and a height of 12 cm? use 3.14 for pi. round your answer to the nearest hund
natima [27]
The answer is 452.16 cm³.
Formula to calculate the volume of cone = V = πr²x h/3
Now r = 6 cm and h = 12cm, and value of π = 3.14
By putting the values,
V = (3.14) (6)² (12/3) = (3.14)(36)(4) 
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3 0
3 years ago
Isabel has ridden 16 miles of a bike course. The course is 80 miles long. What percentage of the course has Isabel ridden so far
OlgaM077 [116]

Answer:

20%

Step-by-step explanation:

Divide 16 by 80 and you get 0.2 as an answer and to get a percent you move the decimal 2 places to the right to fet 20%

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3 years ago
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Determine whether 5x^3 – 25y is a polynomial. If so, which type?
kotykmax [81]

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B polynomial; binomial

Step-by-step explanation:

Yes, it is a polynomial, as it has two terms therefore it is a binomial.

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3 years ago
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Which expression is equivalent to 42+90?
MrRissso [65]

Step-by-step explanation:

42+90 can be written in many ways.

Fore example, it can be written with double negatives, or even commutative property.

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Sorry if it's wrong...

4 0
4 years ago
-x+4y=24 and -2x+y=-8 as an ordered pair
Stels [109]

Answer: (8,8)

Step-by-step explanation:

First you need to get a x or y by itself.

I choosed to get y by itself since it would be faster.

-2x + y = -8  (first get -2x to the other side so add 2x)

y = -8 + 2x (then you want to insert that to the other equation)

-x + 4( -8 +2x) = 24      ->    -x -32 + 8x = 24   ->   7x -32 = 24

(add 32 to the other side)

7x = 56 (divide 7 to 56 to get x) x = 8

now insert into the other equation

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then you get your answer, y= 8

5 0
3 years ago
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