Zapisz w jak najprostszej postaci: Matematyka zad 5 a ib str 87 matematyka 2
a) (x+3y) do 2 potęgi - 9y do 2 potęgi
b) 4x do 2 potęgi +1-(2x+1) do 2 potęgi
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a)
(x+3y)^2 - 9y^2 = x^2 + 6xy + 9y^2 - 9y^2=x^2+6xy
b)
4x^2 +1 -(2x+1)^2 = 4x^2 +1 - (4x^2 + 4x +1)=
= 4x^2 +1 -4x^2 -4x -1 = -4x