Question

Factorise: 3x³ - 3x² - 42x + 72 using factor theorem.​

Answer 1

Answer:

https://brainly.in/question/5223522

Answer 2

factors of 72 are 1 - 1 2 - 23 - 3 and so on

so why taking x is equal to 3

PX is equal to 3 x cube minus 3 x square - 42 X + 72

taking value of x is equal to 3

3*(3)3 - 3*(3)2 -42*3 +72=0

3*27 - 3*9 - 126 +72=0

81-27-126+72=0

-72+72=0

0=0

therefore the x minus 3 is factored of 3 x cube minus 3 x square - 42 X + 72

x-3is the final answer