Resposta:
de 1 a 4 ∫ 5 - x²/5 dx
de 1 a 4 ∫ 5 - (1/5)* x² dx
### ∫ a dx = ax + c ...a e c são constantes
### ∫ x^n dx = xⁿ⁺¹/(n+1) + c
### integral definida as constantes 'c' se anulam
de 1 a 4 [5x - (1/5)* x²⁺¹/(2+1) ]
de 1 a 4 [5x - (1/5)* x³/3 ]
de 1 a 4 [5x - x³/15 ]
=[5*4-4³/15] - [ 5*1 -1³/15]
=20 -64/15 -5 +1/15
=20-5 -64/15 +1/15
=15 -63/15
=15 - 21/5
=(15*5-21)/5
=54/5 =10,8
