Greatest common factor of the two terms namely 20a¹²b² and -15a⁸b⁴ of expression 20a¹²b² - 15a⁸b⁴ is 5a³b²

20a¹²b²⁰ = 5a³b² (4a⁹) and - 15a⁸b⁴ = 5a³b² (-3a⁵b²)

20a¹²b² - 15a⁸b⁴ = 5a³b² (4a⁹ - 3a⁵b²)