Question

г)5c(2c+a)+(3c-2a) (5a-2c). д) (5y-3)²-(2-5y)²

Answer 1

Г) 5c(2c+a)+(3c-2a) (5a-2c)=10c²+5ac +15ac-6c²-10a²+4c=4c²-10a²+20ac+4c
д) (5y-3)²-(2-5y)²=25y²-30y+9-4+20y-25y²=-10y+5