Factorise 3 (x+2) ^2-10 (x+2) + 3

Question

Mathematics

Nyla

28 February, 13:02

Factorise 3 (x+2) ^2-10 (x+2) + 3

+1

Answers (1)

Know the Answer?

Lilia Richard · Answer 1

The answer is (x - 1) (3x + 5)

Let's substitute (x + 2) with a:

3 (x + 2) ² - 10 (x + 2) + 3 = 3a² - 10a + 3 =

= 3a² - 9a - a + 3 =

= 3a * a - 3a * 3 - (a - 3) =

= 3a (a - 3) - (a - 3) =

= (a - 3) (3a - 1)

Now, substitute a with x + 2:

(a - 3) (3a - 1) = (x + 2 - 3) (3 (x + 2) - 1) =

= (x - 1) (3x + 6 - 1) =

= (x - 1) (3x + 5)