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(x-1)*(x+1) = x2 - x + x - 1 = x2 - 1
So, when x = 30,
29*31 = 30*30 - 1
Or, since 30*30 = 900, 29*31 = 900-1 = 899
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∙ 14y agoThis answer is:
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Earn +20 ptsQ: If 30 times 30 equals 900 why does 29 times 31 equal 899?
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Related questions
What 2 numbers equal 900?
One example is 1 + 899.
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To get the next number after any number, just add 1.
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