Question

Se A=$(x+2)^2$, B=$(x+3)(x-3)$, C=(x-1)^2, Calcule A+B+C

Answer 1

$A=(x+2)^2= x^{2} +4x+4$

$B=(x+3)(x-3)= x^{2} -9$

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

$A+B+C= x^{2} +4x+4+x^{2} -9+x^{2} -2x+1= 3x^{2} +2x-4$