Question

$x^{2} + 4x + 3$ si  $( x^{2} +3x)( x^{2} +3x+2)$

Answer 1

Formezi un patrat:
1.) x²+2*2x+4 - 1= (x+2)² - 1 = (x+2-1)(x+2+1) = (x+1)(x+3)
2.)  (x²+3x) ( x²+2x+1+x+1) = (x²+3x) [(x+1)²+ (x+1)] = (x²+3x) (x+1) (x+2) = [ (x+2x+1 +x-1)]((x+1)(x+2)] = [(x+1)²+(x-1)] (x+1)(x+2) =