Найти производную функции и ее значение

Y=8x15-22x4+21x3-31x+3, при х = 0.
y'=8x15-22x4+21x3-31x+3'=u±v'=u'±v';xn'=n∙xn-1;x'=1; Cu'=C∙u'C'=0; x'=1.=
=8x15'-22x4'+21x3'-31x'+3'=
=8∙15∙x15-1-22∙4∙x4-1+21∙3∙x3-1-31∙1+0=
=120x14-88x3+63x2-31.
y0'=120∙014-88∙03+63∙02-31=-31.
Ответ: y'=120x14-88x3+63x2-31 ; y0'=-31;