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Basic Operations & Factorization
Linear Equations
Quadratic Equations

If x + y = 7 and xy = 6,
the value of (x3 + y3) is : 

Answer: C. 217

-> x3 + y3
= (x + y)3 - 3xy (x + y)
= (7)3 - 3(6)(7)
= 343 - (3 x 6 x 7)
= 217

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