Question

(y+5)^2-(y-5) (y+5) найдите значение выражение

при y=-4.7

Answer 1

(y+5)²-(y-5)(y+5)=(y+5)(y+5-(y-5))=(y+5)(y+5-y+5)=(y+5)*10
при у=-4,7  (-4,7+5)*10=0,3*10=3

Answer 2

(у+5)²-(у-5)(у+5)=(у+5)²-(у-5)²=(-4,7+5)²-(-4,7-5)²=0,3²-(-9,7)²=0,3²+9,7²=0,09+94,09=94,18