Question

do this in copy
Add 5a²b²-7b²c²-9c²a² and4a²b²+b²c²-c²a²and subtract2a²b²-2b²c²-5c²a²​

Answer 1

Answer:

7a^2b^2-4b^2c^2-5c^2a^2

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Answer 2

Answer:

• (5a²b²-7b²c²-9c²a²)+(4a²b²+b²c²-c²a²)- (2a²b²-2b²c²-5c²a²)

$\huge{ \color{lime}=7 a^2 b^2 - 5 a^2 c^2 - 4 b^2 c^2}$

$\color{grey} \large{Δ_a = 16 b^2 c^2 (7 b^2 - 5 c^2)}$