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15 February, 14:30

Which of the following is the correct expansion of (y + 1) (y2 + 2y + 3) ?

y3 + 3y2 + 5y + 3

y3 + y2 + y + 3

y3 + 6y2 + 5y + 9

y3 + 5y2 + 6y + 3

+1
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  1. 15 February, 15:57
    0
    Use distributive property:

    (a + b) (c + d) = ac + ad + bc + bd

    (y + 1) (y² + 2y + 3) = (y) (y²) + (y) (2y) + (y) (3) + (1) (y²) + (1) (2y) + (1) (3)

    = y³ + 2y² + 3y + y² + 2y + 3 = y³ + (2y² + y²) + (3y + 2y) + 3

    = y³ + 3y² + 5y + 3
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