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3 years ago

What is the a-value in the following quadratic equation? y=-x^2+x-20 Find the value

Mathematics

2 answers:

Anastaziya [24]3 years ago

8 0

Answer:

a=1

Step-by-step explanation:

y=ax^2+bx+c

y=x^2+x-20

a=1

b=1

c=-20

mestny [16]3 years ago

3 0

The answer would be a =1

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2 years ago

What joins one vertex to another and one face to another which is usually by a line segment called?

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3 years ago

Suppose you have 48 feet of fencing to enclose a rectangular dog pen. The function

Rufina [12.5K]

Take first derivative of area function and set it to zero

da/dx=24 - 2x=0

Now it is set to zero add -2x to both side

24 - 2x = 0

24 = 2x

Now divide by 2 in both sides

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3 years ago

Jerry solved the system of equations. x minus 3 y = 1. 7 x + 2 y = 7. As the first step, he decided to solve for y in the second

Reika [66]

Answer:

A. The variable x in the first equation has a coefficient of one so there will be fewer steps to the solution.

Step-by-step explanation:

Given

$Equation\ 1: x - 3y = 1$

$Equation\ 2: 7x + 2y = 7$

Required

Efficient way of solving the equations

The efficient way of solving this problem is by solving for x in the first equation because it has a coefficient of 1;

The evidence is shown as follows;

Make x the subject of formula in equation 1

$x = 1 + 3y$

Substitute 1 + 3y for x in equation 2

$7x + 2y = 7$

$7(1 + 3y) + 2y = 7$

Open bracket

$7 + 21y + 2y = 7$

$7 + 23y =7$

Make y the subject of formula

$23y = 7 - 7$

$23y = 0$

Divide both sides by 23

$\frac{23y}{23} = \frac{0}{23}$

$y = 0$

Recall that x = 1 + 3y

Substitute 0 for y in the above expression

$x = 1 + 3(0)$

$x = 1 + 0$

$x = 1$

Solving for y in the second equation will take more steps

6 0

3 years ago

the larger of two numbers js 11 more than twice the smaller number. the sum of the number is 1 less than 7 times the smaller num

den301095 [7]

Answer:

smaller: 3

larger: 27

Step-by-step explanation:

Hope this helps!

5 0

3 years ago