3 years ago

What is the factor form of 2x^2-25=0 and -4x^2+81=0

1 answer:

8 0

$2x^2-25=0\\\\(x\sqrt2)^2=5^2=0\\\\(x\sqrt2-5)(x\sqrt2+5)=0\\-------------------------\\-4x^2+81=0\\\\81-4x^2=0\\\\9^2-(2x)^2=0\\\\(9-2x)(9+2x)=0\\------------------------\\Used:\\(a-b)(a+b)=a^2-b^2$

You might be interested in

A city water tank holds 20 gallons of water. A technician empties 25% of the tank. How many more gallons of water must be remove

faust18 [17]

More gallons of water in the tank have 2/5 water in it

8 0

3 years ago

Which is a solution to 2x squared -7 x= 3 ?

vovikov84 [41]

Your answer would be A:x=3

6 0

3 years ago

Steve and Abby purchased a set of vases to place on a 12 foot long mantel above their fireplace. They want to place one vase 1/4

Nonamiya [84]

Answer: One vase should be placed 3 feet from the end of the mantel and the other vase should be placed 9 feet from the same end.

Step-by-step explanation:

You know that lenght of the mantel above their fireplace is 12 feet.

They want to place one vase $\frac{1}{4}$ of the distance from one end of the mantel. This distance in feet is:

$distance_{vase1}=(12feet)(\frac{1}{4})\\\\distance_{vase1}=3feet$

They want to place the other vase $\frac{3}{4}$ of the distance from the same end of the mantel. Therefore, this distance in feet is:

$distance_{vase2}=(12feet)(\frac{3}{4})\\\\distance_{vase2}=\frac{36feet}{4}\\\\distance_{vase2}=9feet$

Therefore, one vase should be placed 3 feet from the end of the mantel and the other vase should be placed 9 feet from the same end.

5 0

3 years ago

Rose purchased 2 packs of red pens, 4 packs of black pens, and 3 packs of blue pens. The cost of each pack of pens was $2.50. Th

Nutka1998 [239]

Answer:

each pack costs 2.5, she bought x packs

x=2+4+3=9

she bought 9 packs

so 2.5 times 9=22.50

she spend $22.50

6 0

3 years ago

Read 2 more answers

Pls help me<br> !!!!!!!!!!!!!!!!!!!!

Angelina_Jolie [31]

its 50.3.2 tags: c c c cc cc c c c c ar c free car no yes show two plus pwe

5 0

2 years ago