Question

. If the value of the polynomial x4 + 2x3 – 3x2 + mx – 1 is 21 when x = 2, then find m

Answer 1

Answer:

x4+2x3-3x2+mx-1=21

now putting the value of x

2^4+2×2^3-3×2+m×2=21

16+16-6+2m=21

26+2m=21

2m=-5

m=-5/2