Question

Determine, se existirem, os zeros das funçoes quadraticas usando a formula:
c) f(x)= -X2+2X+8

d) f(x)= x2+10x+25​

Answer 1

c)f(1)=-1.2+2.(-1)+8= 8

f(0)= -0.2+2.(-0)+8=8

f(-1)= -(-1).2+2.(-1)+8=4

d)f(1)=1.2+10.1+25=37

f(0)= 0.2+10.0+25=25

f(-1)=(-1).2+10.(-1)+25=13