Question

ajutatima va rog ex 10

Answer 1

a) (a-√2)²-(a+√2)²+3√2=
=a²-2a√2+2-a²-2a√2-2+3√2=
=-4a√2+3√2=
=√2(3-4a)

b) (a²-2ab+b²)/(a-b)+a+b=
=(a-b)²/(a-b)+a+b=
=a-b+a+b=2a

c) (x²-4y²)/(x+2y) -2y=
=(x-2y)(x+2y)/(x+2y) -2y=
=x-2y -2y=
=x-4y

d) (√5-x)² +(x+√5)² -4√5=
=5-2x√5+x² +x²+2x√5+5 -4√5=
=2x²-4√5+10

e)(a-2x)² -4x²-a²=
=a²-4ax+4x² -4x²-a²=
=-4ax