Which shows the following equation when factorised?

x² - 49

Whichs shows the following equation when factorised?

x² - 6x - 7

Which shows the following equation when factorised?

x² - 9x + 20

Which shows the following equation when factorised?

x² - 7x - 30

Which shows the following equation when factorised?

x² +8x - 20

Which shows the following equation when factorised?

x² + 7x + 10