Someone know how to do this?: 6x2+18x=0

1 answer:

4 0

The answer to the question is: Yes.

Explanation: It can be solved by following exactly the same procedures
that solved the other two questions that you posted within the past 15 minutes.

Since I'm here already, here is the solution to this one:

6x² + 18x = 0

Divide each side of the equation by 6 :

x² + 3x = 0

Factor the left side:

x(x+ 3) = 0

This statement is true if x=0 or if x=3.

The solution to this one is even the same as the solution to the last one you posted.
You really ought to take a break, go back, review the solutions you've been given,
and try to solve a few on your own.

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Solve the following 3 × 3 system. Enter the coordinates of the solution below.

love history [14]

The system is:

i) 2x – 3y – 2z = 4
ii) x + 3y + 2z = –7
iii) –4x – 4y – 2z = 10

the last equation can be simplified, by dividing by -2,

thus we have:

i) 2x – 3y – 2z = 4
ii) x + 3y + 2z = –7
iii) 2x +2y +z = -5

The procedure to solve the system is as follows:

first use any pairs of 2 equations (for example i and ii, i and iii) and equalize them by using one of the variables:

i) 2x – 3y – 2z = 4
iii) 2x +2y +z = -5

2x can be written as 3y+2z+4 from the first equation, and -2y-z-5 from the third equation.

Equalize:

3y+2z+4=-2y-z-5, group common terms:
5y+3z=-9

similarly, using i and ii, eliminate x:

i) 2x – 3y – 2z = 4
ii) x + 3y + 2z = –7

multiply the second equation by 2:

i) 2x – 3y – 2z = 4
ii) 2x + 6y + 4z = –14

thus 2x=3y+2z+4 from i and 2x=-6y-4z-14 from ii:

3y+2z+4=-6y-4z-14
9y+6z=-18

So we get 2 equations with variables y and z:

a) 5y+3z=-9
b) 9y+6z=-18

now the aim of the method is clear: We eliminate one of the variables, creating a system of 2 linear equations with 2 variables, which we can solve by any of the standard methods.

Let's use elimination method, multiply the equation a by -2:

a) -10y-6z=18
b) 9y+6z=-18
------------------------ add the equations:

-10y+9y-6z+6z=18-18
-y=0
y=0,

thus :
9y+6z=-18
0+6z=-18
z=-3

Finally to find x, use any of the equations i, ii or iii:

2x – 3y – 2z = 4

2x – 3*0 – 2(-3) = 4

2x+6=4

2x=-2

x=-1

Solution: (x, y, z) = (-1, 0, -3 )

Remark: it is always a good attitude to check the answer, because often calculations mistakes can be made:

check by substituting x=-1, y=0, z=-3 in each of the 3 equations and see that for these numbers the equalities hold.

3 0

3 years ago

Read 2 more answers

What does x equal in this problem

IgorLugansk [536]

Answer:

i think 9

Step-by-step explanation:

45/5 is 9 so hope thus helps

6 0

3 years ago

Read 2 more answers

Need help with math probelm if do 5 stars and brainly points

PtichkaEL [24]

Step-by-step explanation:

let's first convert feet to inches

4 ft = 48 inches ( width )

6.5 ft = 78 inches ( length )

12.5 ft = 150 inches ( height )

each cube is 1/4 x 1/4 x 1/4

x-axis ( length )

78 ÷ 1/4 = 78 x 4 = 312 cubes

y-axis ( width )

48 x 4 = 192 cubes

z-axis ( height )

150 x 4 = 600 cubes

the total number of cubes fit in the closet is :

312 x 192 x 600 = 35,942,400 cubes

6 0

2 years ago

Write the equation of the sphere in standard form. x^2 + y^2 + z^2 + 2x − 4y − 6z = 22

madam [21]

The equation $x^{2} +y^{2} +z^{2} +2x-4y-6z=22$ in standard form looks like $(x+1)^{2} +(y-2)^{2} +(z-3)^{2} =(6)^{2}$ .

Given equation of sphere be $x^{2} +y^{2} +z^{2} +2x-4y-6z=22$ .

We are required to express the given equation in the standard form of the equation of sphere.

Equation is basically relationship between two or more variables that are expressed in equal to form. Equation of two variables look like ax+by=c. It may be linear equation,quadratic equation, cubic equation or many more depending on the powers of variables. The standard form of the equation of sphere looks like $x^{2} +y^{2} +z^{2} =r^{2}$ .