Help: Who's Good At Math?

[coldLBZ]

That's all the questions for today, I promise. :angel:

 

[SmokeShow]

I'm not seeing the where +4a -10a = 14a.... I get that to be -6a???

Here's how I did it and get the right answer....

(a+2)^2 - (2a-4)(3a+1)

distribute that minus I have in bold and get the following:

(a+2)^2 + (-2a+4)(3a+1)

working it out...

a^2+4a+4 - 6a^2+10a+4

do the addition and subtraction of like terms and get:

-5a^2+14a+8



C-ya

 

[LBZ]

:dunce:

Here is math I understand:

:alcoholic:+:driving2:=:cruch:+:cop:
:alc:+:fart:=:barf:
:alcoholic:+:dancenana:+:cheerleader:+:kisskiss:+ :ban-hump:=:baby:+:broke:

That is all for today kids:rofl:

 

[coldLBZ]

I'm not seeing the where +4a -10a = 14a.... I get that to be -6a???

Here's how I did it and get the right answer....

(a+2)^2 - (2a-4)(3a+1)

distribute that minus I have in bold and get the following:

(a+2)^2 + (-2a+4)(3a+1)

working it out...

a^2+4a+4 - 6a^2+10a+4

do the addition and subtraction of like terms and get:

-5a^2+14a+8



C-ya

I just went through it the way your posted, and I came up with the same answer as you. Can you explain "distributing the minus"? Thanks.

 

[coldLBZ]

Dale, I took applied math too!

 

[LBZ]

Dale, I took applied math too!

:rofl:

 

[dmax tim]

Here is math I understand:

:alcoholic:+:dancenana:+:cheerleader:+:kisskiss:+ :ban-hump:=:baby:+:broke:

my kind of math toooo.



I had algebra in 7th and 8th grade, which was only 30 years ago :rofl:

 

[slowlmm]

:dunce:

Here is math I understand:

:alcoholic:+:driving2:=:cruch:+:cop:
:alc:+:fart:=:barf:
:alcoholic:+:dancenana:+:cheerleader:+:kisskiss:+ :ban-hump:=:baby:+:broke:

That is all for today kids:rofl:

:rofl::rofl::rofl: me to

 

[JoshH]

See if this help or just confuses you more:

 

[Gasuout]

Johnny :dunce: Duh !

Reading this thread made me remember why I ditched math class in school . :rofl:

Give me a wrench and a motor to build ..... Math sucks !! :barf:

 

[slowlmm]

Johnny :dunce: Duh !

Reading this thread made me remember why I ditched math class in school . :rofl:

Give me a wrench and a motor to build ..... Math sucks !! :barf:

you have whrences and a motor to build :rofl:

 

[coldLBZ]

Thanks JoshH, how did you know to multiply the stuff in the parenthesis by -1? Thanks.

Daniel

 

[Mike L.]

:dunce:

Here is math I understand:

:alcoholic:+:driving2:=:cruch:+:cop:
:alc:+:fart:=:barf:
:alcoholic:+:dancenana:+:cheerleader:+:kisskiss:+ :ban-hump:=:baby:+:broke:

That is all for today kids:rofl:

Thanks to this.

 

[Idaho CTD]

Thanks JoshH, how did you know to multiply the stuff in the parenthesis by -1? Thanks.

Daniel

He change it to from subtraction to addition. In order to do so he multiplies everything after the - sign by -1.

 

[JoshH]

Thanks JoshH, how did you know to multiply the stuff in the parenthesis by -1? Thanks.

Daniel

Like Nathan said, rather than subtracting, you're adding a negative. Since the two sets are multiplied together you can either multiply one set of parethesis by -1 or the whole thing once you've multiplied it together.

Think of it like this if it was 7-2*3 it could also be written 7+-2*3 or 7+2*(-3)it would be 7-6 or 7+(-6). No matter how you write it, you end up with the same answer. It's the same thing with your equation, just a little simpler.

 

[coldLBZ]

Thanks.