Question

Descompuneți:
a)
${x}^{2} + 4x + 3 = ...$
b)
${ x}^{2} - 4x - 5 = ...$
va rog!!!!

Answer 1

x² + 4 x + 3 = x² + x + 3 x + 3 = x ( x + 1) + 3 ( x + 1 ) = ( x + 1) ( x + 3) 

x² - 4 x - 5 = x²  + x - 5 x - 5 = x ( x + 1) - 5 ( x + 1 ) = ( x + 1) ( x - 5) 

Answer 2

a)
x²+4x+3⇔x²+3x+x+3⇔x(x+3)+(x+3)⇔(x+1)(x+3);
b)
x²-4x-5⇔x²+x-5x-5⇔x(x+1)-5(x+1)⇔(x-5)(x+1);
Bafta!