Question

z2 - 5z + 4 factorise​

Answer 1

Answer:

${z}^{2} - 5z + 4$

${z}^{2} - 4z - z + 4 = 0$

$z(z - 4 ) - 1(z - 4) = 0$

$z = 4 \: or \: 1$

Answer 2

Answer:

Answer:

{z}^{2} - 5z + 4z

2

−5z+4

{z}^{2} - 4z - z + 4 = 0z

2

−4z−z+4=0

z(z - 4 ) - 1(z - 4) = 0z(z−4)−1(z−4)=0

z = 4 \: or \: 1z=