Posted by mysterychicken on .
Help!!
13. Use the Distributive Property to simplify 7(6x^2 + 5x + 4)
15. Evaluate 5w^2 if w = .5
19. Write a simplified expression to represent 5 times the sum of x and 3 increased by 10.
Is it 10+5(x+3) ?
Thanks
MC

Algebra 
mysterychicken,
Also,
15. Evaluate 5w^2 if w = .5
Is the answer 6.25?
MC 
Algebra 
Reiny,
13. 7(6x^2 + 5x + 4)
= 42x^2 + 35x + 28
Many mathematicians would consider
7(6x^2 + 5x + 4) to be more "simplified" than the expanded version.
15. 5(.5)^2 = 5(.25) = 1.25
19. yes 
Algebra 
mysterychicken,
I don't quite understand how you got that for #15..don't you have to take it to the second power?
And 7(6x^2 + 5x + 4) to be more "simplified" than the expanded version..what is this for?
Thanks
MC 
Algebra 
Reiny,
I did.
5(.5)^2
= 5(.5)(.5)
= 5(.25)
= 1.25
For the other part, I simply commented that the original expression in factored form is considered to be more simplified than the expanded form. In other words, the question is poorly worded.
I should have simply said, "Expand" 
Algebra 
mysterychicken,
Okay, thanks for your help!
MC