Question

Calculati folosind formule de calcul prescurtat :
a) (√5-√3)(√5+√3)= 
b) (3x+5)²+(5x-3)²=

Answer 1

a)$a) [tex]\sqrt{5} ^{2} - \sqrt{3} ^{2} =5-3=2$
b)$9x^{2} +30x+25+25 x^{2} -30x+9=34 x^{2} +34$
sper ca te-am ajutat!

Answer 2

     a) (√5-√3)(√5+√3)=5-3=2                                                                                                b) (3x+5)²+(5x-3)²= 9x²+25+30x+25x²+9-30x=34x²+34