Zadanie 4
3x+2x^2-4(x-2)+(3x-8)(4+x)=3x+2x^2-4x+8+12x+3x^2-32-8x=
=5x^2+3x-24
Zadanie 5
a)
(2x+3)^2=(2x)^2-2*2x*3+3^2=4x^2-12x+9
b)
(2\sqrt3-5)^2=(2\sqrt3)^2-2*2\sqrt3*5+5^2=4*3-20\sqrt3+25=37-20\sqrt3
c)
(4x-12)(4x+12)=(4x)^2-12^2=16x^2-144=16(x^2-9)
d)
202^2=(200+2)^2=40000+2*200*2+2^2=40000+800+4=40804
e)
(5a-3)^3=(5a)^^3-3*(5a)^2*3+3*5a*3^2-3^3=125a^3-9*25a^2+135a-27=
=125a^3-225a^2+135a-27