Say the answer in the back of the book is -(x+3)(x-10) is (x+3)(10-x) also correct?

Question

1.Say the answer in the back of the book is -(x+3)(x-10) is (x+3)(10-x) also correct?

 

2. A rock fall from a tower that is 464 feet height. as it is falling, its height is given by d formula h=464-16t^2. how many sec will it take for the rock to hit d ground (h=0) 

 

3,find the least common denominator 1/21x^8, 1/63x^5

Answer 1

1) yes, -(x+3)(x-10)=(x+3)[-(x-10)]=(x+3)[-x+10]=(x+3)(10-x)

 

2) 0=464-16t^2

    16t^2=464

       t^2=464/16

       t^2=29

       t=√29=5.385 seconds

 

 3) 21x^8=21x^5*x^3

     63x^5=21x^5*3

     LCD=21x^5