alleryWhich identity helps compute 119 squared quickly?
A(a-b)2 rule
Ba2-b2 rule
C(x+a)(x+b)
D(a+b+c)2
Answer & Solution
Correct answer: D. (a+b+c)2
1. Write 119 as 100 plus 10 plus 9.
2. That is a sum of three numbers.
3. So the identity for (a + b + c)2 does the work.
4. The answer is (a+b+c)2.
_Source: syllabus Mathematics, Ch 4 'Exploring Algebraic Identities'_
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