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Question about Parts of Algebraic Expressions

Math

CMRJ

Parts of Algebraic Expressions

Hard

(CMRJ 2013) - Question Hard of Math

Observe the sequence of figures below, built with black and white balls, all of the same size. "Figure 1 is composed of 1 white ball surrounded by 8 black balls. Figure 2, 4 white balls surrounded by 12 black balls and so on." The number of black balls in the figure composed of 676 white balls is
Question illustration
a.
108
b.
98
c.
138
d.
128
e.
118

Answer:

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