Question

expand (3ײ ‐ 9) ( 3ײ ‐ 4)​

Answer 1

Answer:

☆ Given - (3ײ ‐ 9) ( 3ײ ‐ 4)

☆ To do - expand

☆ Solution

Using identity (x+ a )(x+ b) = x^2 + (a + b) x + ab

(3x^2)^2 + ((-9)+ (-4))3x^2 + (-9)(-4)

9x^4 + (-13)3x^2 + 36

9x^4 - 39x^2 + 36

# Be brainly

Answer 2

Answer :

9x² - 39x + 36

Solution :

(3x² - 9)(3x² - 4)

It is in the form (x² + a)(x² + b)

(x² + a)(x² + b) = x² + (a + b)x + ab

Here, x = (3x²)

a = -9

b = -4

→ x² + (a + b)x + ab

→ (3x²)² + (-9 - 4)3x² + (-9)(-4)

→ 9x⁴ - 39x² + 36