Evaluate the following using x² - y2 = (x + y)(x - y).
a. 71²-69²
b. (1.1)² - (0.9)2
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Answer:
a. = (71+69)(71-69)
= (140)(2)
= 280 Answer
b. = (1.1+0.9)(1.1-0.9)
= (2)(0.2)
= 0.4 answer
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