SOLUTION: i need help please what find the product (2x-3)3x2+5x-7) find the product (-8ab5) (5a4b) factor completely 5x2-45x factor completely , if possible x2-13x

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: i need help please what find the product (2x-3)3x2+5x-7) find the product (-8ab5) (5a4b) factor completely 5x2-45x factor completely , if possible x2-13x      Log On


   

Question 145979: i need help please what find the product (2x-3)3x2+5x-7)

find the product (-8ab5) (5a4b)
factor completely 5x2-45x
factor completely , if possible x2-13x+36
factor completely , if possible x2+x-30

send it to my email please i need this today monday i have to gave my homewok to school so please


Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
I'll do the first two to get you started

# 1



%282x-3%29%283x%5E2%2B5x-7%29 Start with the given expression.


2x%283x%5E2%2B5x-7%29-3%283x%5E2%2B5x-7%29 Expand.


Distribute.


6%2Ax%5E3%2B10%2Ax%5E2-14%2Ax-9%2Ax%5E2-15%2Ax%2B21 Multiply.


6%2Ax%5E3%2Bx%5E2-29%2Ax%2B21 Now combine like terms.


So %282x-3%29%283x%5E2%2B5x-7%29 expands to 6%2Ax%5E3%2Bx%5E2-29%2Ax%2B21.


In other words, %282x-3%29%283x%5E2%2B5x-7%29=6%2Ax%5E3%2Bx%5E2-29%2Ax%2B21.







# 2




%28-8ab%5E5%29%2A%285a%5E4b%29 Start with the given expression.


-40ab%5E5%2Aa%5E4b Multiply the coefficients -8 and 5 to get -40


-40a%5E%281%2B4%29b%5E%285%2B1%29 When you multiply monomials, simply add the exponents.


-40a%5E5b%5E6 Add.


So %28-8ab%5E5%29%2A%285a%5E4b%29=-40a%5E5b%5E6.