Question

calcular o 26° termo da p.a (-4,1,6)

Answer 1

n = 1- (-4)
n= 5


an = a1 + (n-1)r
a26 = -4 + (26 -1 ) 5
a26 = -4 + 25*5
a26= -4 +125
a26 = 121

Answer 2

$PA~(-4, 1, 6,...)\\\\ a_{26}=?\\a_1=-4\\ n=26\\ r=6-1=5\\\\\\ a_n=a_1+(n-1).r\\\\\\ a_{26}=-4+(26-1).5\to \\\\ a_{26}=-4+25.5\to \\\\ a_{26}=-4+125\to \\\\ \boxed{\boxed{a_{26}=121}}$