## anonymous 5 years ago (2x2 - 4x – 5) + (10x2 + 3x)

1. anonymous

12x^2-x-5, solve for x using x = -b +or - (sqrt(b2-4ac)/2a)

2. anonymous

i dont understand

3. anonymous

is the equation $(2x ^{2}-4x-5) + 10x ^{2}+3x$ ?

4. anonymous

yes its subtracting polynomials

5. anonymous

then it becomes: $2x ^{2}+10x ^{2}-4x+3x-5 \rightarrow \rightarrow 12x ^{2}-x-5$

6. anonymous

you are basically bunching up all the x^2 terms together, all the x terms together and all the constants together. If you are asked to solve this equation for x, then you can solve it using the formula i gave above for quadratic equations, but if you are not asked to solve for x, don't worry about it just yet.

7. anonymous

lol what he's trying to say is, let's expand it and you'll get :$= 2x^2-4x-5 +10x^2 + 3x$ let's add, and we'll get : $= 12x^2-x-5$ done ^_^ , understand it now? :)

8. anonymous

lol, thats exactly it. sorry, my maths is a bit rusty. it's all kind of obvious to me.

9. anonymous

haha its ok but thank you

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