Question 255020
1) x^2+5x-14 = 0
  x^2+7x-2x-14 =0
 x(x+7)-2(x+7) = 0
  (x+7)(x-2)=0
         x+7=0  or  x-2=0
          x= -7   or x=2

2) 49x^2 - 25=0
   (7x)^2- 5^2 =0
    (7x+5)(7x-5) =0
            7x+5 =0  or  7x-5=0
               7x=-5  or   7x=5          
                x = -5/7  or  x=5/7

3)4x^2-13x+3 =0
  4x^2-12x-x+3 =0
  4x(x-3)-1(x-3) =0
   (x-3)(4x-1) =0
        x-3 =0  or  4x-1=0
          x=3   or  4x=1
          x=3   or   x=1/4