4 years ago

Factorise fully 21a - 7a^2

Mathematics

2 answers:

photoshop1234 [79]4 years ago

6 0

Answer:

7(3a-a^2)

Step-by-step explanation:

7 divided into 21 is 3

7(3a-a^2)

MrRissso [65]4 years ago

5 0

3a(7-a)
Have a great day!!!

You might be interested in

A route from point A to point B. 1 inch on the map equals 25 miles.

sweet [91]

Question:

A route from point A to point B. 1 inch on the map equals 25 miles.

Manuel is leaving Boston to go on a hike at Mt. Monadnock, in New Hampshire. He mapped out a route with the map scale of 1 in. = 25 mi and found the total distance on the map to be about 3.2 inches. What is the actual distance Manuel will travel?

Answer:

Point A to point B - 1 inch on the map = 25 miles - <u>80</u> Miles

Step-by-step explanation:

6 0

3 years ago

Read 2 more answers

I need help with my math homework

OLEGan [10]

You need help answering all of them right ??

3 0

3 years ago

What is the sample space for spinning a square spinner labeled A, B, C, D?

Liula [17]

D Would Be My Guess >.>

3 0

3 years ago

1-8: TRUE OR FALSE Use trig to find the missing measure.

arsen [322]

I believe that its true hby?.

8 0

3 years ago

3(5y - 4) + 31 - 3y) = 3(2y - 3)<br> How to solve it

kumpel [21]

After solving $3(5y - 4) + 31 - 3y = 3(2y - 3)$ the value of y is $y=-\frac{14}{3}\,\,or\,\,y= -4.66$

Step-by-step explanation:

We need to solve the expression:

$3(5y - 4) + 31 - 3y = 3(2y - 3)$

and find the value of y

Solving:

$3(5y - 4) + 31 - 3y = 3(2y - 3)\\15y-12+31-3y=6y-9\\Combining\,\,like\,\,terms:\\15y-3y-6y=-9+12-31\\15y-9y=12-40\\6y=-28\\y=-\frac{28}{6}\\y=-\frac{14}{3}\\or\,\,y= -4.66$

So, after solving $3(5y - 4) + 31 - 3y = 3(2y - 3)$ the value of y is $y=-\frac{14}{3}\,\,or\,\,y= -4.66$

Keywords: Solving the expressions

Learn more about Solving the expressions at:

#learnwithBrainly

3 0

4 years ago