Tan Zihao's answer to Cindy's Secondary 4 E Maths question.
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Let 5n+1 be a, 5n-1 be b.
Recall algebra equation a^2 - b^2 = (a+b)(a-b)
Recall algebra equation a^2 - b^2 = (a+b)(a-b)
Date Posted:
7 years ago
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