Question

② Ex) = (x + 1)² + 2(x + 1)(x-2) + (x - 2)²
E(x) = (2x-1)², pt. arice nr real x



RAPID DAU COROANA

Answer 1

($x^{2} +2x+1+2(x^{2} -2x+x-2)+x^{2} -4x+4=\\x^{2} +2x+1+2x^{2} -4x+2x-4+x^{2} -4x+4=\\(x^{2} +2x^{2} +x^{2} )+(2x-4x+2x-4x)+(1-4+4)=\\4x^{2} -4x+1=\\(2x-1)^{2}$