Question

what is the coefficient of z in (z - 5 )3

Answer 1

Answer:

3

Step-by-step explanation:

(z -5)3

=3z-15

therefore ans is 3

because coefficient is no. before variable

on sloving the bracket we get the above answer

THANKYOU

Answer 2

$(z-5)^{2}$

= $z^3-5^3-3*z^2*5+3*z^*5^2$     { Using identity $(a-b)^3$ = $a^3-b^3-3a^b+3ab^2$ }

= $(z-5)^3=z^3-125-15x^2+75z$

∴ Coefficient of z = 75