Question

Os números (10, x- 3, x + 3) são os 3 primeiros termos de uma PA de termos positivos, sendo x≠0. O décimo termo desta P.A. é igual a? * 1 ponto 10 13 16 19 6

Answer 1

Resposta:

$a_1_0=64$

Explicação passo-a-passo:

$PA(a_1,a_2,a_3,a_4,...)\\\\a_2-a_1=a_3-a_2\\\\x-3-10=x+3-(x-3)\\\\x-3-10=x+3-x+3\\\\x =6+3+10\\\\x=19\\\\PA(10,19-3,19+3,...)\\\\PA=(10,16,22,...)\\\\a_1_0=a_1+9r\\\\r=16-10=6\\\\a_1)=10+9.6\\\\a_1_0=10+54\\\\a_1_0=64$