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Please help and show an explanation? Sorry. Thank you!

 Dec 11, 2018
 #1
avatar+104796 
+1

First one

 

Notice that the last term  has to be  "+25"

So....we can eliminate  A and D  because their final terms  will yield  " -25"

 

Since all therr terms of the polynomial are positive, the factors will only have a "+" involved

 

Look  at C

 

(2x + 5) (x + 5)   = 2x^2 + 5x + 10x + 25  = 2x^2 + 15x + 25

 

So....this is the correct choice......

 

 

cool cool cool

 Dec 11, 2018
 #3
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Thank you very much!! :)

Guest Dec 11, 2018
 #2
avatar+104796 
+1

Second one

 

To find out what the original expression was under the radical, we can evaluate this :

 

( 2^3)*12  * (a^3)^3  *  (b^2)^3 * b   =

 

8*12  * a^9  * b^6*b =

 

96a^9b^7

 

So   "A" is correct

 

cool cool cool

 Dec 11, 2018
 #4
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Thank you!

Guest Dec 11, 2018

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