(2a\Xb2 - 6ab) + (5ab -15b\Xb2)

(2a² - 6ab) + (5ab -15b²)

 

Answer:

2a²−6ab+5ab−15b²

=2a²−6ab+5ab−15b²

=(2a²)+(−6ab+5ab)+(−15b²)

=2a²−ab−15b²


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