Let's express the following expression as a of two squares :
391*409
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6
391 x 409
= (400 - 9)(400 + 9)
= 400² - 9² ... (a - b)(a + b) = a² - b²
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2
Answer:
Step-by-step explanation:
391 x 409
= (400 - 9)(400 + 9)
= 400² - 9² ... (a - b)(a + b) = a² - b²
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