All categories

4 years ago

How do i simplify (3x-y) (3x+y)

Mathematics

1 answer:

Solnce55 [7]4 years ago

5 0

Answer:

Step-by-step explanation:

alright so first you want to multiply 3x by 3x and y

so far you have 9x^2+3xy

then you do y x 3x and y x y

now you have 9x^2+3xy+3xy+y^2

then you combine like terms to get the final answer of

9x62 + 6x^2y^2 + y^2

You might be interested in

What is the constant of proportionality in the equation y equals 2.5 x

Anastaziya [24]

First you must state that the relationship is proportional. It is because it goes into the origin.

y = 2.5x

k = 2.5 And 2.5 is the constant of proportionality.

7 0

3 years ago

Read 2 more answers

Write down the decimal equivalent to;

Nesterboy [21]

A) 25% = 25/100 = 0.25

b) 18% = 18/100 = 0.18

c) 40% = 40/100 = 0.40

d) 2% = 2/100 = 0.02

e) 0.15% = 0.15/100 = 0.0015

3 0

3 years ago

Read 2 more answers

What is f(9)=2x81-3*3

Ksenya-84 [330]

PEMDAS

f(9)=2x81-3*3

f(9) = 162 - 9

f(9) = 153

4 0

3 years ago

Two towns are 1,100 miles apart. A group of hikers Starts from each town and walks down the trail toward each other. They meet a

OLga [1]

Answer:

3.54 and 1.04

Step-by-step explanation:

Given:

Two towns are 1,100 miles apart.

A group of hikers Starts from each town and walks down the trail toward each other..

They meet after a total hiking time of 240 hours.

If one group travels 2 1/2 mile per hour slower than the other group.

Question asked:

Find the rate of each group.

Solution:

Let speed of faster hiker = $x\ mph$

Speed of slower hiker = $x-\frac{5}{2}\ mph$

As we know:

$Distance=speed\times time$

Total distance between two town = Total combined speed of both hikers $\times$ Total combined time taken

$1100=(x+x-\frac{5}{2} )\times240\\ \\ Dividing\ both\ sides\ by\ 240\\ \\ 4.58=(x+x-\frac{5}{2} )\\ \\ 4.58=2x-\frac{5}{2} \\ \\Adding\ both\ sides\ by\ \frac{5}{2} \\ \\ 4.58+ \frac{5}{2}=2x- \frac{5}{2}+ \frac{5}{2}\\ \\ \frac{2\times4.58+5}{2} =2x\\ \\ \frac{14.16}{2} =2x\\ \\ By \ cross\ multiplication\\ \\ 2\times2x=14.16\\ \\ 4x=14.16$