Hey guys sorry i have been gone for so long but can anyone give me any help on the following questions I'm stuck on these...this is algebra 3 if it helps at all with the understanding of the process.

directions: Factor completely

64+25y^2 -80y

0.004x^2 - 0.28x + 0.49

49p^2 -84pq +36q^2

t^3 + 2t^2 - 4t - 8

Question

Hey guys sorry i have been gone for so long but can anyone give me any help on the following questions I'm stuck on these...this is algebra 3 if it helps at all with the understanding of the process. 

directions: Factor completely 

64+25y^2 -80y 



0.004x^2 - 0.28x + 0.49



49p^2 -84pq +36q^2 





t^3 + 2t^2 - 4t - 8

anonymous · Answer

anybody understand this?

anonymous · Answer

You need to start by putting them into standard form. $$ax ^{2} + bx + c$$

After that you can use any form of factoring (guess and check, AC, box), complete the square, or the quadratic formula. If you need me to work one or two out I can

anonymous · Answer

if you could work out the decimal one and the last one that would be great!!

anonymous · Answer

ashley_king?

anonymous · Answer

Sorry I was away from my keyboard.

Anyways, with the decimal one, all i did was plug everything into my calculator in the quadratic form format. What I got was .004(x-68.2039)(x-1.79608)

With the last one, since it's a cubic quadrilateral, you're going to seperate the four terms into two, and take the GCF out of each of those terms.
|dw:1425340590767:dw|

Now you're going to combine the new terms.|dw:1425340644577:dw|

Since (T^2-4) is a perfect square, you can keep factoring. Your answer should be:
(t-2)(t+2)(t+1)

anonymous · Answer

thank you very much for the help on that question and also do you know how to do the decimal question one?

anonymous · Answer

oh nvm lol didnt see the decimal answer tha tyou gave me