Question

will mark as brainlist if you answer this with steps

Answer 1

hope this will help you
pls follow me and mark as brainliest if this helps

Answer 2

x-3=0(taken for remainder theorem)
x=3, put it in equation
x^4-3x^2+4x-12
3^4-3*3^2+4*3-12
81-27+12-12
=54