Question

Wykonaj podane działnia, a wynik doprowadź do najprostszej postaci.

a)(2a-3b+1)(8a+b)+9(a-5)

b)5x(2-7x)-(3x+4)2x

c)6(2-y)(5x+y)+3(x+y)(x-8)

Answer 1

a)(2a-3b+1)(8a+b)+9(a-5) =

= 16a²+2ab-24ab-3b²+8a+b+9a-45=

=16a²+17a-22ab-3b²+b-45

 

 

b)5x*(2-7x)-(3x+4)*2x = 10x-35x²-6x²+8x = -41x²+18x

 

 

c)6*(2-y)(5x+y)+3*(x+y)(x-8)=

= 6*(10x+2y-5xy-y²)+3*(x²-8x+xy-8y)=

= 60x+12y-30xy-6y²+3x²-24x+3xy-24y =

= 3x²+36x-27xy-6y²-12y