Question

Am nevoie urgent!
1.A(3,2)
B(-2,4)
Calculati ecuatia AB
2.ABC Triunghi
a=6
b=8
c-10
Calculati R=?
3.2^X(2x+1)+2^x-1=132
4. Calculati 4x-2x-12=0
5.Triunghi ABC
A(3,2)
B(-2,3)
C(6,-5)
Calculati mediana dusa din A

Answer 1

1.y-2/4-2=x-3/3+2<=>y-2/2=x-3/5(aducem la acelasi numitor)=>5y-10=2x-6<=>5y=2x+4
2.Nu stiu sa-l fac:))
3.2^x(2x+1)+2^x-1=132<=>2^(2x+1)+2^x-1=2^7+2^2 <=> 2x+1+x-1=7+2<=>3x=9|:3<=>x=3
4. 4x-2x-12=0
  a=4;b=-2;c=-12  facem delta .....delta(semnul ala de triunghi:))...delta=(-2)^2 -4*4*(-12)=4-16*(-12)=4+192=196=>delta=14
x1=2+14/4*2=16/8=2
x2=2-14/4*2=12/8|:4=3/2
5.Mediana dusa din A este mijlocul lui BC =>Mij BC=(x1+x2/2 ; y1+y2/2)=(-2+6/2;3-5/2)=(4/2;-2/2)=(2;-1)