Question

Va rog mult ex 11 .Dau coroana!!!

Answer 1

11. a) (x-1)(x-2) =
= x(x-2)-1(x-2)
= x²-2x-x²+2
= -2x+2 = -2(x-1).

b) (x-3)(x+6) =
= x(x+6)-3(x+6)
= x²+6x-3x-18
= 3x-18 = 3(x-6).

c) (x+4)(x+5) =
= x(x+5)+4(x+5)
= x²+5x+4x+20
= x²+9x+20.

d) (2x+7)(x-2) =
= 2x(x-2)+7(x-2)
= 2x²-4x+7x-14
= 2x²+3x-14.

e) (1-2x)(3x+5) =
= 1(3x+5)-2x(3x+5)
= 3x+5-6x²-10x
= -6x²-7x+5.

f) (2x+3)(5x-4) =
= 2x(5x-4)+3(5x-4)
= 10x²-8x+15x-12
= 10x²+7x-12.

g) (2a+3b)(3a-b) =
= 2a(3a-b)+3b(3a-b)
= 6a²-2ab+9ab-3b²
= 6a²-3b²+7ab.

h) (4x+3y)(4x-3y) =
= 16x²-9y².


Little White Lies

Answer 2

Sper ca te-am ajutat!