Question

oblicz wartosc wyrazenia (2a+1)^2 + (2a-1)^2 dla a= 1/√2

Answer 1

(2a + 1)^2 + (2a - 1)^2=  4a² + 4a + 1 + 4a² - 4a + 1 = 8a² + 2

 

8a² + 2 = 8 * (1/√2)² + 2 = 8 * 1/2 + 2 = 4 + 2 = 6  ----  odpwoiedx