Question

please solve sum 4 please

Answer 1

4×8+4×4-2-1
32+16-3
48-3
=45
it's help you

Answer 2

2x+1=0
2x= -1
x= -1/2
using factor theorem
p(x)= -1/2
p(-1/2)= 4(-1/2)³+4(-1/2)² -(-1/2) - 1
           = -4/8 + 4/4 + 1/2 -1
           = -1/2+1+1/2-1 (cancelling out -1 and +1)
           = -1/2+1/2
p(-1/2) =0