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a fost răspuns

calculati: a) (x√5+y√3)(5x²-xy√15+3y²) ; b)(2x+1)(2x-1)-(2x+1)(2x+1)=

Răspuns :

a) (x√5+y√3)(5x²-xy√15+3y²)=5√5x³-√75x²y+3√5xy²+5√3x²y-√45xy²+3√3y³=
5√5x³-5√3x²y+5√3x²y+3√5xy²-3√5xy²+3√3y³=
5√5y³+3√3y³ b)(2x+1)(2x-1)-(2x+1)(2x+1)=4x²-2x+2x-1-(4x²+2x+2x+1)=
4x²-1-4x²-4x+1=-4x