Question

9x^2-12x+4 si 25+40x+16x^2

Answer 1

$\bf 9x^{2}-12x+4=$

$\bf (3x)^{2}-2\cdot2\cdot 3x+2^{2}=$

$\boxed{\bf (3x-2)^{2}}$

$\bf 25 +40x +16x^{2}=$

$\bf 5^{2} +2\cdot 5\cdot 4x +(4x)^{2}=$

$\boxed{\bf (5+4x)^{2}}$

Formula de calcul prescurtat: (a ± b)² = a² ± 2·a·b + b²