Question

in the expansion of X - 5 whole cube the coefficient of x square if​

Answer 1

Answer:

3,-5 will be the coefficient of x²

Answer 2

$\red{ Expansion \: of \: ( x - 5 )^{3}}$

$= x^{3} - 3 \times x^{2} \times 5 + 3 \times x \times 5^{2} - 5^{3}$

/* By Algebraic Identity */

$\boxed { \pink { ( a - b )^{3} = a^{3} - 3a^{2}b + 3ab^{2} - b^{3} }}$

$= x^{3} - 15 x^{2} + 75 \times x - 125$

$Now, \red{ Coefficient \: of \: x^{2} } \green {= -15 }$

$\red{ Coefficient \: of \: x } \green {= 75 }$

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