Question

(3a - b)(a + b) - (3a - b)²

Answer 1

Answer:

9a² - 6ab + b²

Step-by-step explanation:

サナマカヘルプ。thanks

Answer 2

Given,

$(3a-b)(a+b)-(3a-b)^{2}$

Evaluate the given expression,

$3a^{2}+3ab-ab-b^{2}-(9a^{2}+b^{2} -6ab )$

$3a^{2}+2ab-b^{2}-9a^{2}-b^{2}+6ab$

$=-6a^{2}-2b^{2}+8ab$

$=-(6a^{2}+2b^{2}-8ab )$

Therefore, the answer is $-(6a^{2}+2b^{2}-8ab)$.