use the formula to expand (x - 7) cube
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The coefficient of x7 in the expansion of
is : 144
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Answer:
(x-7)^3 = x^3 - 7^3 -3x^2 (7) +3 (7)^2 x
=) x^3 - 343 -21x^2 + 3 (49) x
=) x^3 - 343 -21x^2 + 147x
=) (x-7)^3 = x^3 -21x^2 + 147x -343
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