Question

(5a² -7b²+12ab) - (11ab - 9a² - 12b²)
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Answer 1

$\fbox\red{Correct Question:}$

$\rm{(5 {a}^{2} - 7 {b}^{2} + 12ab) - (11ab - 9 {a}^{2} - 12 {b}^{2}) }$

$\fbox\red{Required Answer :}$

$\rm \blue{ = 5 {a}^{2} + 9 {a}^{2} - 7 {b}^{2} + 12 {b}^{2} + 12ab - 11ab}$

$\rm \blue{ = ( - 4 {a}^{2}) + 5 {b}^{2} + ab}$

$\rm \orange{\implies{( - 4 {a}^{2}) + 5 {b}^{2} + ab}}$

Hope This helps

Thank you!!

@itzshivani