Question

(x-3)^2=10x^2-(3x-4)(3x+4)

Answer 1

( x - 3 )^2 = 10x^2 - ( 3x - 4 )( 3x + 4 ) 
x^2 - 6x + 9 = 10x^2 - 9x^2 + 16
x^2 - 6x + 9 = x^2 + 16 
- 6x = 16 - 9 
- x = 7 : 6 
x = - 1 1/6