Questions & Answers for: Casio 131

...x^2-22x=10 Just complete the squarex^2-22x-10=x^2-2(x)*11+11^2-11^2-10=(x-11)^2-121-10=(x-11)^2- 131.Use the identity a^2-b^2=(a-b)(a+b) with a=(x-11) and b= square root (131)Solutions are x1= 11