subtract (10x^2+7x-2) - (4x^2-2x+2)

Question

anonymous · Answer

6x^2+9x-4

akshay_budhkar · Answer

6x^2+9x-4 just subtract the like terms

anonymous · Answer

first remove the parentheses distributing the minus sign. change the sign of everything after the parentheses in the second term. you get 
$$10x^2+7x-2-4x^2+2x-2$$

anonymous · Answer

yup. gone now!

akshay_budhkar · Answer

lol yea

anonymous · Answer

rosie you see how to distribute the minus sign.  you turn all + to - and all - to +

anonymous · Answer

yes i understand that

anonymous · Answer

$$- (4x^2-2x+2)=-4x^2+2x-2$$ leave the first term alone

anonymous · Answer

so once you have 
$$10x^2+7x-2-4x^2+2x-2$$ you need to combine like terms.   can you do that?

anonymous · Answer

yes

akshay_budhkar · Answer

i like the way you explain step by step...

anonymous · Answer

i will group them together. they are 
$$10x^2-4x^2+7x+2x-2-2$$ go ahead and combine them

anonymous · Answer

@akshay thanks

anonymous · Answer

6x^2 +9x

anonymous · Answer

close

akshay_budhkar · Answer

you are close but check again

anonymous · Answer

$$10x^2-4x^2=6x^2$$
$$7x+2x=9x$$
$$-2-2$$=?

anonymous · Answer

you made a common mistake on the last one.  
$$-2-2$$ is not the same as $$2-2$$

anonymous · Answer

$$2-2=0$$ but 
$$-2-2=?$$

anonymous · Answer

-4

anonymous · Answer

got it so now you have the answer!

akshay_budhkar · Answer

cool you got it!!!
keep it up!

anonymous · Answer

careful with your signs on the test. don't rush through.  really.

anonymous · Answer

Multiply (4x+5)(2x^2-x-3

anonymous · Answer

think we did this one yes?  multiply everything in the second parentheses by 4x, then multiply it all by 5, then combine like terms

anonymous · Answer

whats the rule for the signs? multiply and division are the same and addition and subtraction are the same?

anonymous · Answer

i am not sure what you mean. the rules for multiplication and division are different from addition and subtraction

anonymous · Answer

in multiplication and addition two minuses make a plus, but not so in addition.  add to negative numbers, get a negative number.

anonymous · Answer

that doesnt make any sense???

anonymous · Answer

(1/4 a-b)(1/4a+b)

anonymous · Answer

multiply

anonymous · Answer

sure it does.  think about it like this. if you spend $5 and then spend $10 that is like 
$$-5-10$$ which is clearly 
$$-15$$ not 15

anonymous · Answer

if you lose money twice it is  not like you gain money