* (5x-3)²-(5x+3)² =6
=> (5x - 3 - 5x - 3)(5x - 3 + 5x + 3) = 6
=> -6.10x = 6
=> -60x = 6
=> x = -0,1
* (2x-3)²-(x+5)²=0
=> (2x-3-x-5)(2x-3+x+5)=0
=> (x-8)(3x+2)=0
=> x - 8 = 0 hoặc 3x + 2 = 0
=> x = 8 hoặc x = -2/3
* x²-9+(x+3)(3x-5)=0
=> (x-3)(x+3)+(x+3)(3x-5)=0
=> (x+3)(x-3+3x-5)=0
=> (x-3)(4x-8)=0
=> (x-3).4.(x-2)=0
=> (x-3)(x-2)=0
=> x-3=0 hoặc x-2=0
=> x = 3 hoặc x = 2
* (2x-1)²-16=0
=> (2x-1)² - 4² = 0
=> (2x - 1 - 4)(2x - 1 + 4) =0
=> (2x - 5)(2x + 3) =0
=> 2x - 5 = 0 hoặc 2x + 3 = 0
=> x = 5/2 hoặc x = -3/2
* (2x-1)²-(2x)²= 4
=> (2x - 1 - 2x)(2x - 1 + 2x) = 4
=> -1.(4x - 1) = 4
=> -4x + 1 = 4
=> -4x = 3
=> x = -3/4
* x²(2-x)+9(x-2)=0
=> 2x² - x³ + 9x - 18 = 0
=> - x³ + 2x² + 9x - 18 = 0
=> - x² (x - 2) + 9 (x-2) = 0
=> (9 - x²)(x-2) = 0
=> (3 - x)(3 + x)(x - 2) = 0
=> 3 - x = 0 hoặc 3 + x = 0 hoặc x - 2 = 0
=> x = 3 hoặc x = -3 hoặc x = 2
* (x-1)²+4(x-1)=-4
=> (x-1)² + 4(x-1) + 4 = 0
=> (x-1)² + 2.(x-1).2 + 2² = 0
=> (x-1+2)² = 0
=> (x+1)² = 0
=> x + 1 = 0
=> x = -1
* (2x+3)²-2(2x+3)(2x-5)+(2x-5)²=x²+6x+64
=> (2x+3-2x+5)² = x²+6x+64
=> (0x + 8)² = x²+6x+64
=> 64 = x² + 6x + 65
=> x² + 6x = 0
=> x(x+6) = 0
=> x = 0 hoặc x + 6 = 0
=> x = 0 hoặc x = -6