SOLUTION: I have a couple...i just dont get this stuff! (x^3+2x+1)(2x^2-4x-5) and (x-2)(x+7)(2x+3)

Question 118881: I have a couple...i just dont get this stuff!
(x^3+2x+1)(2x^2-4x-5)
and
(x-2)(x+7)(2x+3)

Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
#1

Start with the given expression

Expand the expression. Remember for something like it expands to

Distribute

Multiply

Combine like terms

Now rearrange the terms in descending order

So expands and simplifies to .

In other words,

If you need more help with multiplying polynomials, check out this Long Multiplication Calculator

#2

Start with the given expression

-------------

First let's foil

Start with the given expression

Remember, when you FOIL an expression, you follow this procedure:

Multiply the First terms:

Multiply the Outer terms:

Multiply the Inner terms:

Multiply the Last terms:

Now collect every term to make a single expression

Now combine like terms

So foils and simplifies to

-----------------------

So our expression then becomes

Now let's multiply out

Start with the given expression

Expand the expression. Remember for something like it expands to

Distribute

Multiply

Combine like terms

Now rearrange the terms in descending order

So expands and simplifies to .

In other words,

If you need more help with multiplying polynomials, check out this Long Multiplication Calculator

RELATED QUESTIONS
I have to solve this without using the quadratic equation and really just dont know how... (answered by jim_thompson5910)

2x^8 � x^3 + 4x^2 + 5) � (8x^7 + 8x^3 � 4x) This what I have so far: 2x^8 - 8x^7 -... (answered by ewatrrr)

Solve for x 3(x-6)=2(x+2) I have tried this a couple different times and this is as... (answered by Earlsdon)

Please help me solve this equation: Let f(x)=x^2+2x-1 and g(x)=2x-4. Find 2f(x)-3g(x). (answered by scott8148)

4 problems total. Just says solve the equation. It has been 20 years since I've done this (answered by stanbon)

I am having trouble with solving for x in the following equation: {{{ (x+1)/(x-3)=x+2... (answered by stanbon,edjones)

f(h(x))= when f(x) = 2x-1 and h = x+4 I took (2x-1)(x+4) and that gave me 2x^+8x-x-4... (answered by scott8148)

I have been working on this for 2 days, I just do not get it. Any help would be greatly... (answered by longjonsilver)