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Calculati: a)(x-3)² b) (2x+3)² c) (4x-7)(4x+7) d) (√5-1)²+2(1+√5)²+(√6-3)(√6+3)=


Răspuns :

a)(x-3)²=x²-6x+9
b)  (2x+3)²=4x²+12x+9
c)  (4x-7)(4x+7)=16x²-49
d) (√5-1)²+2(1+√5)²+(√6-3)(√6+3)=5-2√5+1+2(1+2√5+5)+6-9
=5-2√5+1+2+4√5+10+6-9
=15+2√5