Question

${x}^{2} - (x + 1) ^{2}$
​

Answer 1

^ = la puterea

x^2 - ( x + 1 )^2

calculezi ce ai in paranteza folosind formula (a+b)^2=a^2+2ab+b^2

deci vei avea: (x+1)^2=x^2+2x+1

x^2 - ( x^2 + 2x + 1 )

desfaci paranteza tinand cont ca - schimba toate semnele din paranteza

x^2 - x^2 - 2x - 1

(x^2 - x^2 = 0) = se simplifica

deci ramane : -2x - 1

Answer 2

x²-(x²+2x+1)=x²-x²-2x-1= -2x-1