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bagirrra123 [75]

2 years ago

10

For what value of a does the equation ax^2−3x−5=0 have 1 as one of its roots?

1 answer:

allsm [11]2 years ago

5 0

Answer: When a = 8, one of the roots of the equation will be 1.

To solve this problem, you could graph the equation with a 1 in the place of the a on a graphing calculator (there are some online).

Then, just keep changing the a value until the graph crosses the x-axis at 1. When, you enter an a value of 8, it will have a root of 1.

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How do I solve for r

White raven [17]

To solve for R you use PEMDAS

3 0

2 years ago

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Let y′′′−9y′′+20y′=0. find all values of r such that y=erx satisfies the differential equation. if there is more than one correc

DerKrebs [107]

we are given

differential equation as

$y'''-9y''+20y'=0$

we are given

$y=e^{rx}$

Firstly, we will find y' , y'' and y'''

those are first , second and third derivative

First derivative is

$y'=re^{rx}$

Second derivative is

$y''=r*re^{rx}$

$y''=r^2e^{rx}$

Third derivative is

$y'''=r^2*re^{rx}$

$y'''=r^3e^{rx}$

now, we can plug these values into differential equation

and we get

$r^3 e^{rx}-9r^2 e^{rx}+20re^{rx}=0$

now, we can factor out common terms

$e^{rx}(r^3 -9r^2 +20r)=0$

we can move that term on right side

$(r^3 -9r^2 +20r)=0$

now, we can factor out

$r(r^2 -9r +20)=0$

$r(r-5)(r-4)=0$

now, we can set them equal

$r=0$

$r-5=0$

$r=5$

$r-4=0$

$r=4$

so, we will get

$r=0,4,5$ ...............Answer

4 0

2 years ago

6/4 = 8/blank please help me

oksian1 [2.3K]

Answer:

Step-by-step explanation:

6 0

2 years ago

Read 2 more answers

An airplane leaves Los Angeles and travels five hours to New YorkCity. The return trip travels along the same route and takes si

finlep [7]

The distance of the plane flies between the two cities is 1,113.75 miles

The formula for calculating the distance travelled is expressed as:

D = vt where:

v is the speed

t is the time taken

Given the following:

v = 99mi/hr

Total time taken = 5hr + 6.25hr

Total time taken = 11.25hr

Get the required distance

Distance = 99mi/hr * 11.25hr

Distance = 1,113.75miles

Hence the distance of the plane flies between the two cities is 1,113.75 miles

learn more here: brainly.com/question/7245260

4 0

2 years ago

Quanto é 48.1/2 ?<br> Help me

dolphi86 [110]

E uma divisao simples.

48.1/2 = 24.05

4 0

2 years ago