Упростите выражение (c-5)^2-4c(-10-2c)

Question

Упростите выражение (c-5)^2-4c(-10-2c)

Answer 1

(c-5)^2-4c(-10-2c)=c^2-10c+25+40c+8c^2=9c^2+30c+25

Comments

=(3c)^2+2*3c*5+5^2=(3c+5)^2.

Answer 2

(c-5)^2-4c(-10-2c)

c^2-10c+25+40c+8c^2

9c^2+30c+25