3 years ago

How to factor 25x^2 - 81= 0

1 answer:

4 0

Your question is a difference of squares. both terms that need to be factored are squared. to solve take the square root of each put into two terms one of addition and one of subtraction.

anwser= (5x-9)(5x+9)

the reason this works is because when you foil you get
25x²-45x+45x-81
the middle terms cancel revealing
25x²-81

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lukranit [14]

what are you asking i don't understand

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3 years ago

Solve for . Simplify your answer as much as possible. please help

Sonja [21]

Answer:

$x=-6$

Step-by-step explanation:

So we have the equation:

$-34=7(x+8)+8x$

First, distribute the 7 into the (x+8) and simplify:

$-34=7(x)+7(8)+8x\\-34=7x+56+8x$

Combine the like terms 7x and 8x by adding them together:

$-34=56+15x$

Subtract 56 from both sides to isolate the x:

$-34-56=15x+56-56\\15x=-90$

Divide both sides by 15 to get x:

$x=-90/15=-6$

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3 years ago

Rick rents a car from a company that charges him $25 per day plus 10 cents per mile driven. Which expression can represent the a

3241004551 [841]

Let x be the number of days and y represent miles driven.

Since it costs 25 per day, you multiply 25 by x.
25x

10 cents (otherwise known as .1 dollars) per mile, multiply .1 times y. Now add the two.
.1y

25x+.1y

The answer is <span>a.) 25x + 0.1y</span>.

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3 years ago

Use the quadratic formula to find the solution to the quadratic equation in the box below.

nekit [7.7K]

The solution to the quadratic equation is option D

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3 years ago

Which type of graph would be best used for showing the percentage of students in each grade level at a middle school

stepladder [879]

Answer:

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3 years ago