Question

pilneee! prosze o pomoc!

jutro mam z tego klasowke!

http://iv.pl/images/38242675537110055881.jpg
http://iv.pl/images/98941132197290660467.jpg

Answer 1

a)

(x-1)^2-(x+4)^2=2x+1

x^2-1-x^2-8=2x+1

2x^2-5=2x+1

2x^2-x-6=0

delta=b^2-4ac

delta=(-2)^2-4*(-2)*(-6)

delta=4-48

delta=-44

b)

(x+5)^2-(x-3)^2=x+1

x^2+25-x^2+9=x+1

34=x+1

33=X

c)

(x+1)^2+(x-3)(x+3)-2=2(x-1)^2

x^2+1+x^2+3x-3x-9-2=2(x^-1)

2x^2-10=2x^2-1

-9=0

d)

(2-x)(2+x)+(x+3)=x-7

4+2x-2x-x^2+x^2+9=x-7

13=x-7

20=x

e)

x^2+9-(4x+16-x^2-4x)=2(x-1)^2+1

2x^2-7=2x^2-2+1

f)

x^2-25-(x^2-9)=4x-8

x^25-x^2+9=4x-8

-16=4x-8

-8=4x/:4

2=x