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3 years ago

The square of a number is 15 more than 2 times the number

Mathematics

1 answer:

UkoKoshka [18]3 years ago

3 0

x^2 = 2x + 15

x^2 -2x - 15 = 0

Factor:

(x-5)(x+3) = 0

x = 5 or x = -3

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Nady [450]

Hello,
To exist x≠0

if x>0 then
x+2/x>=3==>x²+2>=3x
==>x²-3x+2>=0
==>(x-2)(x-1)>=0 positive out of the roots
==> (x<=1 or x>=2) and x>0
==>(0<x<=1) or (x>=2)
else
x<0
x+2/x>=3==>x²+2<=3x
==>x²-3x+2<=0 negative betheen the roots
==>(1<=x<=2) and x<0 : no solution
end if

4 0

2 years ago

Fred and Ben each ran laps around the track. Fred completed his run in 16 minutes. Ben completed his run in 3/4 of the amount of

m_a_m_a [10]

Answer:

Time required by Ben was 12 minutes.

Step-by-step explanation:

Given:

Time Required for Fred = 16 mins

Ben completed his run in 3/4 of the amount of time of Freds run.

We need to find the time required by Ben.

Now Given that;

Ben completed his run in 3/4 of the amount of time of Freds run.

It means that time required by Ben is equal to 3/4 times time required by Fred.

Time required by Ben = $\frac{3}{4}\times Freds \ run$

Time required by Ben = $\frac{3}{4}\times 16 = 12\ mins$

Hence Time required by Ben was 12 minutes.

7 0

3 years ago

Simplify 5 square root of 11 end root minus 12 square root of 11 end root minus 2 square root of 11 . (1 point)

Luden [163]

Answer: negative 9 square root of 11
explanation:
5√11 - 12√11 - 2√11
collect like terms by calculating the sum or difference of their coefficients:
(5-12-2) √11
(5-12-2) = (5-14) = -9
so, -9√11

5 0

3 years ago

STUDY TIP 1

Mandarinka [93]

Answer:

THANK U!

FOR THE TIP.

HAVE A GREAT DAY!

6 0

2 years ago

C=2pir; r=4.6 find c

ratelena [41]

C = 2 * pi(3.14) * 4.6

C ~ 28.903

3 0

2 years ago