Question

(7a^2 -8ab -b^2) - (a^2 + 2ab -3b^2) =​

Answer 1

7a² - 8ab - b² - ( a² + 2ab - 3b² )

7a² - 8ab - b² - a² - 2ab + 3b²

6a² - 10ab - 5b² ➡ Answer

Answer 2

Step-by-step explanation:

$\\ \sf\longmapsto (7a^2-8ab-b^2)-(a^2+2ab-3b^2)$

$\\ \sf\longmapsto 7a^2-8ab-b^2-a^2-2ab+3b^2$

$\\ \sf\longmapsto 7a^2-a^2-8ab-2ab-b^2+3b^2$

$\\ \sf\longmapsto 6a^2-10ab+2b^2$

$\\ \sf\longmapsto 2(3a^2-5ab+b^2)$