Answer:
Step-by-step explanation:
A quadratic expresion is of the form
where
The give options are:
From the given options, the only expression which is quadratic is
where a =5, b=9 and c=-1
Therefore the correct choice is the second option.
Answer:
Value of x=4 and y=-13/3
Step-by-step explanation:
We need to solve the systems of equations
Solving using substitution method:
Let:
Find value of x from eq(1) and put in eq(2)
Put value of x in eq(2)
Now, finding value of x by putting value of y in eq(1)
So, Value of x=4 and y=-13/3
The answer to this question:
<span>north and south sides 16ft
east and west sides 8ft
</span>
In this question, the east and west fencing cost is $4/ft but the south and north fencing cost is $2/ft. The cost is cheaper for fencing north and south side which cost half of the east and west side. The perimeter is made by adding the south, north, east and west side.
If x = north and south fencing and y= is east and west side, then you can get this equation
cost= (south+north) * $2 + (east+west)*$4
128=(x+x) * 2 + (y+ y) * 4
128= 4x + 8y
32= x+ 2y
x= 32-2y
The area is count by multiplying the width and length, which was x and y in this question. The formula should be:
area= length * width
area= x * y
area= (32-2y) * y
area= 32y - 2y^2
Then, you need to find the value of y needed for the maximum area.
32y- 2y^2
32 - 2*2y=0
32= 4y
y= 8
If y=8 then
x= 32-2y
x= 32- 16= 16
He can't write the equation because slope can't pass through x=3 twice.
In this case, (3,4) and (3,0). There can't be two exact same value in a slope.
