Question

1.Zapisz w jak najprostszej postaci: b) (a+2)do kwadratu -(a-2)do kwadratu a) x(5x-2)-2x(x+1) c) (a+2b)(2a-b)-3ab d) (a+2pod pierwiastkiem)(a-2pod pierwiastkiem)-2(a kw. -1) prosze!!!!!!;****

Answer 1

a)x(5x-2)-2x(x+1)=5x-2x-2x-2x=-1x

 

b)(a+2)²-(a-2)²=a²+2²-a²+2²=4²

 

c) (a+2b)(2a-b)-3ab=a+2b·2a-b-3ab=2a+b-3ab

 

d)(√a+2)(√a-2)-2(a²-1)=√a+2·√a-2-2a²+2=-2a+2

 

na 99% dobrze :)

Answer 2

Zad.1

a)

x(5x-2)-2x(x+1) =5x^2 -2x-2x^2 -2x =3x^2 - 4x

b)

(a+2)^2 -(a-2)^2 =a^2 +4a+4-(a^2 -4a+4) =a^2 +4a+4-a^2 +4a-4 = 8a

c)

(a+2b)(2a-b)-3ab = 2a^2 -ab+4ab-2b^2 -3ab = 2a^2 - 2b^2

d)

(a+V2)(a-V2)-2(a^2 -1) =a^2 -2 -2a^2 +2 = -a^2