Mathematics

Cedric Fry

31 July, 16:43

Penelope determined the solutions of the quadratic function by completing the square.

f (x) = 4x2 + 8x + 1

-1 = 4x2 + 8x

-1 = 4 (x2 + 2x)

-1 + 1 = 4 (x2 + 2x + 1)

0 = 4 (x + 2) 2

0 = (x + 2) 2

0 = x + 2

-2 = x

What error did Penelope make in her work?

+4

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