Question

qual o valor númerico da expressão 3a2+5a-10 para. A)a=0 B)a=-1 C)a=1/2 D)a=2/5​

Answer 1

Explicação passo-a-passo:

3a²+5.a-10=

A)3.0²+5.0-10= 0+0-10=-10

B)3.(-1)²+5.(-1)-10=3.1-5-10=3-5-10=-12

C)3.(1/2)²+5.(1/2)-10=

3.(1/4)+5/2-10=

3/4+5/2-10=

3+10-40/4=

13-40/4=

-27/4

D) 3.(2/5)²+5.(2/5)-10=

3.4/25+10/5-10=

12/25+2-10=

12/25 - 8=

12-200/25=

-188/25