Question

$add \: 5 \: {a}^{2} \: - \: 7 \: {b}^{2} \: - \: 2ab \: and \: 3 \: ab \: - \: {a}^{2} \: + \: 3 \: {b}^{2}$
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Answer 1

Step-by-step explanation:

4a^2-4b^2+ab is the correct answer.

Answer 2

Answer:

4a² - 4b² + ab

Step-by-step explanation:

( 5a² - 7b² - 2ab) + ( 3ab - a² + 3b²)

= ( 5a² - a²) + (-7b² + 3b²) + (-2ab+3ab)

= 4a² - 4b² + ab