Question

z²-12z-45 factorise
please answer​

Answer 1

Answer:

z² - 12z -45

z² - 15z + 3z - 45

z(z - 15) +3(z-15)

(z-15)(z+3)

Answer 2

Answer:

$z {}^{2} - 12z - 45 \\ z {}^{2} + 3z - 15z - 45 \\ z(z + 3) - 15(z + 3) \\ (z - 15)(z + 3)$