Question

a expressao (2a+3)²+(a-5)² é igual a :
(A)5a²+3a+12
(B)2a²+2a+12
(C)5a²+2a+34
(D)2a²+2a+34

Answer 1

Ola Suemary

(2a + 3)² + (a -5)² =

4a² + 12a + 9 + a² - 10a + 25 =

5a² + 2a + 34 (C)

.

Answer 2

(a + b)² + (a-b)² = (a² + 2ab + b²)  +  ( a²  -2ab + b²) = 

agora substitua os valores: ( (2a)² + (2x2ax3)  + (3)²  + ((a)² - (2xax5)  + (5)²

4a²  + 12a + 9 + a² - 10a + 25

5a² + 2a  + 34 letra C