Question

z 5 zapisz wjak najprostszej postaci:

a) (x+3y)^2-9v^2=

b)4x^2+1-(2x+1)^2=

c)2(3+b)^2-12b=

d) (x-2)^2-(x+1)^2=

Answer 1

a) (x+3y)^2-9v^2= x² + 6xy + 9y² - 9v²

b)4x^2+1-(2x+1)^2= 4x² + 1 - 4x² - 4x - 1 = -4x

c)2(3+b)^2-12b= 2(9 + 6b + b²) - 12b = 18 + 12b + 2b² - 12b = 18 + 2b²

d) (x-2)^2-(x+1)^2= x² - 4x + 4 - x² - 2x - 1 = -6x + 3

Answer 2

a)

 

 

b)

 

 

c)

 

 

d)