Zadanie 2
a)
(a+z)^2=a^2+2az+z^2
b)
(y+2)^2=y^2+2*y*2+2^2=y^2+4y+4
c)
(4+a)^2=16+8a+a^2
d)
(3x+1)^2=9x^2+6x+1
e)
(4x+2)^2=16x^2+16x+4
f)
(\frac{1}{2}+5b)^2=(\frac{1}{2})^2+2*\frac{1}{2}*5b+25b^2=\frac{1}{4}+5b+25b^2
g)
(a+2b)^2=a^2+4ab+4b^2
h)
(3x+5y)^2=9x^2+30xy+25y^2
i)
(4x+\frac{2}{3}y)^2=16x^2+2*4x*\frac{2}{3}y+(\frac{2}{3}y)^2=16x^2+\frac{16}{3}y+\frac{4}{9}y^2
wzór skróconego mnożenia
(a+b)^2=a^2+2ab+b^2