( a² + 5 ) × ( a² - 4 )
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Answer:
2a²-20
Explanation:
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Answered by
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= (a²*a²) - (a² * 4) + (5 * a²)-(5*4)
= a^4 - 4a² + 5a² - 20
= a^4 + a² -20
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