Question

)Subtract 5a2
-7ab +5b2
from -3ab -4a2
-8b2

Answer 1

$= - 3ab - 4 {a}^{2} - 8 {b}^{2} - (5 {a}^{2} - 7ab + 5 {b}^{2} )$

$= - 3ab - 4 {a}^{2} - 8 {b}^{2} - 5 {a}^{2} + 7ab - 5 {b}^{2}$

$= - 3ab + 7ab - 4 {a}^{2} - 5 {a}^{2} - 8 {b}^{2} - 5 {b}^{2}$

$= 4ab - 9 {a}^{2} - 13 {b}^{2}$