The value of ${(75.8)^2 - (55.8)^2}/20$ is Options: A . &nbsp40 B . &nbsp121.6 C . &nbsp20 D . &nbsp131.6

The value of ${(75.8)^2 - (55.8)^2}/20$ is

Question

The value of ${(75.8)^2 - (55.8)^2}/20$ is

Options:

A . 40

B . 121.6

C . 20

D . 131.6

Answer: Option D
Answer: (d)${(75.8)^2 - (55.8)^2}/20$= ${(75.8 - 55.8)(75.8 + 55.8)}/20$= ${20 × 131.6}/20$ = 131.6Using Rule 8,${(75.8)^2 - (55.8)^2}/{(75.8 - 55.8)}$= 75.8 + 55.8 = 131.6

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