Question

factorise 3x^2-12x-63​

Answer 1

Answer:

3(x-7)(x+3)

explanation:

3x^2-12x-63

3(x^2-4x-21)

3(x-7)(x+3)

Answer 2

hi mate,

solution: 3x^2-12x-63

Pull out like factors :

3x²- 12x - 63 = 3 • (x²- 4x - 21)

Factoring x² - 4x - 21

x² - 7x + 3x - 21

Step-1: Add up the first 2 terms, pulling out like factors :

x • (x-7)

Add up the last 2 terms, pulling out common factors :

3 • (x-7)

Step-2 : Add up the four terms of step 1:

(x+3) • (x-7)

Which is the desired factorization

Final result :

3 • (x + 3) • (x - 7)

i hope it helps you.