Solve the equation by completing the square.2x2 + 16x + 18 = 0

A. {-4 - -4 + }
B. {4 - 4 + }
C. {-4 + }
D. {-4 - i-4 + i}


Answer: A

Mathematics

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Complete.668 mm =  cm

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Solve the problem.Consider the following simplified digital photograph that has a 3 × 3 grid with four gray levels numbered from 0 to 3. It shows a letter Y in black on a light gray background.Let A be the 3 × 3 matrix that represents this figure digitally. Find the matrix which represents the entire picture becoming one shade lighter.

A.

B.

C.

D.

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