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a) a=5-2=3 

b+c=5, b is 2.

a=3 ; b=2 ; c=3



b) Substitute values from part a.

_{5}C_3\times(2x)^2\times(-7)^3

10\times4x^2\times-343

-13720x^2

The coefficient of the term in x^2 is -13720.

Explanations

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