Question

Упростите выражение (x+6)(x+5)
(a-4)(a+1)
(2-y)(y-8)
(a-4)(2a+1)
(2y-1)(3y+2)
(5x-3)(4-3x)

Answer 1

(x+6)(x+5)  =x²+11x+30

(a-4)(a+1)= a²-3a-4

(2-y)(y-8)= 2y-16-y²+8y= -y²+10y-16

(a-4)(2a+1)  = 2a²+a-8a-4= 2a²-7a-4

(2y-1)(3y+2)= 6y²+4y-3y-2= 6y²+y-2

(5x-3)(4-3x)= 20x-15x²-12+9x= -15x²+29x-12