Question

Wykonaj działania i przedstaw w najprostszej postaci :*

a) 3(2a-p)(4a+4p)-(7a-3p)(2p-a)=?

b) (4x+3)(x-7)-2x(4-2x)(-2-x)=?

Pilne ! dam naj !

Answer 1

a)

   3(2a-p)(4a+4p) - (7a-3p)(2p-a) =

= 3(8a^2 + 8ap-4ap-4p^2) - (14ap-7a^2 - 6p^2 + 3ap) =

= 3(8a^2 + 4ap-4p^2) - (17ap-7a^2 - 6p^2) =

= 24a^2 + 12ap -12p^2 -17ap + 7a^2 + 6p^2 =

= 31a^2 - 5ap - 6p^2

 

b)

   (4x+3)(x-7) - 2x(4-2x)(-2-x) =

= 4x^2 -28x +3x-21-2x(-8-4x+4x+2x^2) =

= 4x^2 - 25x -21 - 2x(-8 + 2x^2) =

= 4x^2 - 25x - 21 + 16x - 4x^3 =

= -4x^3 + 4x^2 - 9x - 21