Question

1.(3x-1)(3x+1)-(3x+2)^2=?
2.(3x-2)(2x+3)=?
3.(3x-2)(3x+2)=?
4.(4x-3)^2(4x+3)(4x-3)+(4x+3)^2=?
5.(x-1)^2-3(2x+3)(2x-3)-(2x+1)^2=?
6.(3x+1)^2-2(4x^2-1)+(3x-1)^2=?
7.(-3x^2+4)(-2x)-(2x^2+2x-6)(3x)-(2x-5)(3x)=?
8.(2√2-)x)^2=?
9. Să se determine cel mai mic numar natural 4^n pentru care:
1001<(√n+√n+1)^2=?
10. Aflati xE |R stiind ca:
a)(2x+3)^+(2x+3)^=90
b)4/2x-1=2x+1/2
c)(2-3x)^=(3-2x)^2
d)(2+3x)^=(3+2x)^2
e)(x-1)^2- (x-1)(x+1)=(x-3)^2-(x+2)^2

Answer 1

1)(3x)^2-1^2-((3x)^2+2*3x*2+2^2)=9x^2-1-(9x^2+12x+4)=9x^2-1-9x^2-12x-4=-12x-5