Question

Rozwiąż równanie : A) (x-5)(x+5) = x do2 -100x B) 4(x+2) do 2 - (2x-1) do 2 = -5

Answer 1

 A) (x-5)(x+5) = x do2 -100x

x²-25-x²+100x = 0

100x = 25

x=25/100 = 1/4

 

 

 

B) 4(x+2) do 2 - (2x-1) do 2 = -5

4(x²+4x+4)-(4x²-4x+1)= -5

4x²+16x+16-4x²+4x-1 = -5

20x = -20

x= -1

 

 

Answer 2

A)

(x-5)(x+5) = x² -100x

x² - 25 = x² - 100x

x² - x² + 100x = 25

100x = 25

x = 25/100 = ¼ = 0,25

 

B)

4(x+2)² - (2x-1)² = -5 

4(x² + 4x + 4) - 4x² + 4x - 1 = - 5

4x² + 16x + 16 - 4x² + 4x - 1 = - 5

4x² - 4x² + 16x + 4x = - 5 - 16 + 1

20x = - 20

x = - 20/20 = - 1