Question

efectuati:(x-3)(x+3)(x²+9)-(x²+2)²+2(x+2)² va rog mult ajutatima

Answer 1

(x-3)(x+3)($x^{2}$+9)-($x^{2}$+2)$^{2}$+2(x+2)$^{2}$=
=($x^{2}$-9)($x^{2}$+9)-(x la puterea 4 +4x$^{2}$+4)+2($x^{2}$+4x+4)=
=x la puterea 4-81-x la puterea 4-4$x^{2}$-4+4$x^{2}$+8x+8    (se reduc x la puterea 4 cu -x la puterea 4, -4$x^{2}$ cu 4$x^{2}$)
=-77+8x