All categories

2 years ago

If the mean proportional between x and 2 is 4, find x

Mathematics

2 answers:

Anastasy [175]2 years ago

5 0

Answer:

explanation

b2=ac

16=2x

x=8

Bad White [126]2 years ago

4 0

Answer:

Step-by-step explanation:

x+2= 4

x= 4-2

x =2

2+2=4

4÷2=2

You might be interested in

******PLEASE HURRY!!!!! WILL GIVE BRAINLIEST ****************

Eduardwww [97]

2 number are x and y
X=10,y=65

8 0

3 years ago

A. X=3 m B. X=5 m C. X=6 m D. X=9 m

enyata [817]

Answer:

ok so we can divide 15 by 5 to get 3

so we know the building is 3 times bigger

so we multiply 3 by 3 to get 9

so the answer is D

8 0

2 years ago

Read 2 more answers

What goes into 125 and 560 evenly

nikitadnepr [17]

The only numbers that go into 125 and 560 evenly are 1 and 5

8 0

2 years ago

What is the remainder of (4x2 + 7x-1)= (4 + x)? A. -9x – 1 B.23x – 1 C.35 D.-37

bearhunter [10]

Answer: I don't know what you meant by remainder but i hope this helps :)

$x=\frac{-3+\sqrt{29}}{4},\:x=-\frac{3+\sqrt{29}}{4}\\$

Step-by-step explanation:

$\left(4x^2+7x-1\right)=\left(4+x\right)\\\mathrm{Refine}\\4x^2+7x-1=4+x\\\mathrm{Subtract\:}x\mathrm{\:from\:both\:sides}\\4x^2+7x-1-x=4+x-x\\Simplify\\4x^2+6x-1=4\\\mathrm{Subtract\:}4\mathrm{\:from\:both\:sides}\\4x^2+6x-1-4=4-4\\\mathrm{Simplify}\\4x^2+6x-5=0\\\mathrm{For\:}\quad a=4,\:b=6,\:c=-5:\\\quad x_{1,\:2}=\frac{-6\pm \sqrt{6^2-4\times \:4\left(-5\right)}}{2\times \:4}$

$\frac{-6+\sqrt{6^2-4\times \:4\left(-5\right)}}{2\times \:4}\\=\frac{-6+\sqrt{6^2+4\times \:4\times \:5}}{2\times \:4}\\=\frac{-6+\sqrt{116}}{2\times \:4}\\=\frac{-6+\sqrt{116}}{8}\\\\Let\: simplify\: ; -6+2\sqrt{29}\\=-2\times \:3+2\sqrt{29}\\=2\left(-3+\sqrt{29}\right)\\=\frac{2\left(-3+\sqrt{29}\right)}{8}\\=\frac{-3+\sqrt{29}}{4}\\$

$\frac{-6-\sqrt{6^2-4\times \:4\left(-5\right)}}{2\times \:4}\\\\=\frac{-6-\sqrt{6^2+4\times \:4\times \:5}}{2\times \:4}\\\\=\frac{-6-\sqrt{116}}{2\times \:4}\\\\=\frac{-6-2\sqrt{29}}{8}\\\\=-\frac{2\left(3+\sqrt{29}\right)}{8}\\\\=-\frac{3+\sqrt{29}}{4}\\\\\\x=\frac{-3+\sqrt{29}}{4},\:x=-\frac{3+\sqrt{29}}{4}$

6 0

2 years ago

Read 2 more answers

(20 points) answer need ASAP:”)

Sergio [31]

Ayy you doing e2020:) Ok the answer would be B. 1/3

6 0

2 years ago

If the mean proportional between x and 2 is 4, find x​

If the mean proportional between x and 2 is 4, find x