Question

..............4,5.....

Answer 1

4. a) E(3)= (3+5)^2-(3+1)(3-3)+4= 8^2-0+4= 64+4= 68

E(-1)= (-1+5)^2-(-1+1)(-1-3)+4= 4^2-0+4=16+4= 20

Ma=(68+20)/2= 88/2= 44 media

b) E(x)= x^2+10x+25-(x^2-3x+x-3)+4= x^2+10x+25-x^2+2x+3+4= 12x+32

5. (x+V6)(x-V6) = (x-V2)(x-V2)

x^2-6 = x^2-xV2-xV2+2

x^2-6 = x^2-2xV2+2

x^2-x^2+2xV2= 2+6

2xV2 = 8

2x = 8/V2 rationalizam cu V2

2x = 8V2/2

2x= 4V2

x= 4V2/2

x= 2V2

Answer 2

Rezolvarea atasata.........