Question

Simplify:-

\[{(2x+5)(4x^2-20x+25)-(2x-5)(4x^2+20x+25)}\]
I got \[-40x^2+250\].

Is it right ??

Answer 1

If no then what is the answer??

give full solution plz :)

Answer 2

@him1618 @lgbasallote plz help :)

Answer 3

If you want me too, I can sit down and work this homogeneous problem out.

Answer 4

sure :)

Answer 5

if you factor it out you get (2x+5)(2x-5)^2 - (2x-5)(2x+5)^2

then if you factor out further..

(2x+5)(2x-5)(2x - 5 - (2x+5) )

right?

Answer 6

so you should get (4x^2 - 25)(-10) then expand

Answer 7

so you're right

Answer 8

but the answer given in my book is \(-40x^2+40x+150\) :(

Answer 9

is the answer given in my book is wrong or i m wrong ??

Answer 10

the question is wrong...?

Answer 11

no, i m talking about the answer

Answer 12

@lgbasallote u there ??

Answer 13

In any case an x term cannot be left out.
So yes, you are right.
Book s wrong.

Answer 14

\[(2x+5)(2x-5)^2-(2x-5)(2x+5)^2=(2x+5)(2x-5)[(2x-5) - (2x+5)]=4x^2-25(-10)=250-40x^2\] do u get it

Answer 15

i think the answer has gone out of page can u see it its...250-40x^2

Answer 16

no ! the exercise is 9.6 & the first question of fourth question

Answer 17

http://www.wolframalpha.com/input/?i=%282x%2B5%29%284x%5E2-20x%2B25%29-%282x-5%29%284x%5E2%2B20x%2B25%29 @jiteshmeghwal9

Answer 18

Thanx @lgbasallote sir :)