Question

Pola figur narysowanych ponizej sa rowne x do kwadratu uloz i rozwiaz odpowiednie rownania tu link http://zapodaj.net/images/ff50f05332a13.jpg prosze o rozwa daje naj

Answer 1

a) x^2 = 1/2 [(x+5)*(2x-4)

 x^2 =1/2[2x^2-4x+10x-20]  |*2

2x^2=2x^2+6x-20

-6x=-20 |: -6

x=20/6 = 3 2/6

b)x^2=(x-2)*(x+10)

x^2=x^2-2x+10x-20

-8x=-20 |:-8

x=20/8 = 2 2/8 

c)x^2=1/2[(x-5+x-4+5)*(x+3)

x^2=1/2[(2x-4)*(x+3)]

x^2=1/2[2x^2+6x -4x-12]|*2

2x^2=2x^2+6x -4x-12

-2x=-12 |: -2

x=12/2 =6