Can someone solve these questions for me

• choixongdong: 1)
  x^2 - 49 = 0
  factor
  (x+7)(x-7) = 0
  x+7 = 0;  x = -7
  x -7 = 0;  x = 7
  
  2)x^2 - 18x + 81 = 0
  factor
  (x- 9)(x - 9) = 0
   x - 9=0;  x = 9
  
  3)
  x^2 + 3x = 40
  x^2+3x - 40 = 0
  factor
  (x + 8)(x - 5) = 0
  x+8 = 0;  x = -8
  x -5 = 0;  x = 5
  
  4)
  3x^2 - 75 = 0
  3(x^2 - 25) = 0
  3(x+5)(x-5) = 0
  x + 5 = 0;  x = -5
  x -  5 = 0;  x = 5
  
  5)
  2x^2 - 15 = 7x
  2x^2 - 7x - 15 = 0
  (2x + 3)(x - 5) = 0
  2x+3 = 0; x = -3/2
  x - 5= 0;   x = 5
  
  6)
  4x^2 + 16x - 48 = 0
  4(x^2 + 4x - 12) = 0
  4(x + 6)(x - 2) = 0
  x + 6 = 0;  x = -6
  x - 2 = 0 ;  x = 2