Solve the system of equations by finding the reduced row-echelon form of the augmented matrix for the system of equations. 9x-4y+z=-4. -x+2y-3z=20. 4x+4y-z=43

  d.  (3, 7, -3)

Step-by-step explanation:

The reduced row-echelon form of the augmented matrix has 1s on the diagonal and zeros off-diagonal, except for the answer in the last column. It can be convenient to start by writing the augmented matrix using the second equation first:

The method may not be strictly according to some algorithm, but it avoids fractions and gives the correct result: (x, y, z) = (3, 7, -3).

f(x) = x^3 -2x^2 -3x

x( x^2 -2x-3)

x( x^2 +x -3x -3)

x( x(x+1) -3(x+1))

x( x-3)( x+1)

so zeroes are 0, 3,-1

its (2) option

answer: i believe the answer is e

step-by-step explanation: