x= 3- 2√6
y= 4√6- 1
oblicz g) (3x+2y)^2
h) 3x-5y - x^2+ y^2
2. √2+ √5 / √5 - √2=
g) (3x+2y)²=[3(3-2√6)+2(4√6-1)]²=(9-6√6+8√6-2)²=(7+2√6)²=49+28√6+24=
= 73+28√6
h) 3x-5y-x²+y²=3(3-2√6)-5(4√6-1)-(3-2√6)²+(4√6-1)²=9-6√6-20√6+5-(9-12√6+24)+96-8√6+1=14-26√6-9+12√6-24+96-8√6+1=78-22√6
==============================================================
2)
√2+√5 (√5+√2)² 5+2√10+2 7+2√10
---------------------- =--------------------------------= ------------------------- = ----------------
√5-√2 (√5-√2)(√5+√2) 5-2 3
wzory: (a+b)(a-b)=a²-b²
(a+b)²=a²+2ab+b²
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g) (3x+2y)²=[3(3-2√6)+2(4√6-1)]²=(9-6√6+8√6-2)²=(7+2√6)²=49+28√6+24=
= 73+28√6
h) 3x-5y-x²+y²=3(3-2√6)-5(4√6-1)-(3-2√6)²+(4√6-1)²=9-6√6-20√6+5-(9-12√6+24)+96-8√6+1=14-26√6-9+12√6-24+96-8√6+1=78-22√6
==============================================================
2)
√2+√5 (√5+√2)² 5+2√10+2 7+2√10
---------------------- =--------------------------------= ------------------------- = ----------------
√5-√2 (√5-√2)(√5+√2) 5-2 3
wzory: (a+b)(a-b)=a²-b²
(a+b)²=a²+2ab+b²