Factorise: a squared +8a -20

1 answer:

8 0

Factor out the 4 in both equations
8a^2-20^2=(2^2 times a^2 times 2)-(2^2 times 5)
therefor it is also equal to
(2a)^2 times 2-(2^2 times 5)
we can force it into a difference of 2 perfect squares which is a^2-b^2=(a-b)(a+b)
(2a√2)^2-(2√5)^2=((2a√2)-(2√5))((2a√2)+(2√5))

You might be interested in

At a greengrocer, two bananas and one apple cost ?1.16 and one banana and one apple cost ?0.71. How much does one apple cost?

Blababa [14]

Answer

Find out the how much does one apple cost .

To prove

Let us assume that the number of bananas be x .

Let us assume that the number of apples be y .

As given

At a greengrocer, two bananas and one apple cost $1.16 .

Than the equation becomes

2x + y = 1.16

one banana and one apple cost $0.71.

Than the equation becomes

x + y = 0.71

Subtracting x + y = 0.71 from 2x + y = 1.16

2x - x + y - y = 1.16 - 0.71

x = 0.45

Put in the equation x + y = 0.71

0.45 + y = 0.71

y = 0.71 - 0.45

y = $0.26

Therefore the cost of the one apple is $0.26 .

4 0

2 years ago

one of the same side exterior angles of two parallel lines is 20 degrees less than the other same side exterior angle find the m

Dmitry_Shevchenko [17]

Answer:

25 I am not a fan of the gas increases when the piston is pushed in the next war

8 0

2 years ago

A student is given the rectangle and square. The student states that the two figures have the same perimeter. Is the student per

Karolina [17]

The student is correct. Due to the meaning of perimeter which is all sides added up to make a number total, it is possible for a square and a rectangle to have the same perimeter if the numbers add up.

7 0

2 years ago

Read 2 more answers

Label each triangle

Ne4ueva [31]

Answer: Top right and left are ACUTE, Bottom right is RIGHT, and bottom left is OBTUSE.

4 0

2 years ago

Read 2 more answers

Subtract 23.4 − 8.78 =_____

Alona [7]

<span>14.62 super simple, good luck with any other questions!</span>