what should be added to 5 a2 +2 ab to get 3 a2 -4 ab ?
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Step-by-step explanation:
(3 a²-4 ab)-( 5 a² + 2)
= 3 a² - 4 ab - 5a² + 2
= -2a² -4ab + 2
= -2( a²+ 2ab-2)
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