Répondre :
(x+4)²-36
=x²+x*4*2+4²-36
=x²+8x+16-36
=x²+8x-20
(3+4)²-36
=3²+3*4*2+4²-36
=9+24+16-36
=33-20
=13
=N²+8N-20
=3²+24-20
=9+4
=13
=x²+x*4*2+4²-36
=x²+8x+16-36
=x²+8x-20
(3+4)²-36
=3²+3*4*2+4²-36
=9+24+16-36
=33-20
=13
=N²+8N-20
=3²+24-20
=9+4
=13