тут 5 вопросов в фото остальные
put the verbs in brackets into the present
perfect, the posf simple or going to.
a: (youifill in)
the job application form yet?
b: no. i (do)
it tomorrow.
a: alex (live)
in london for two years.
b: does he like it there?
a: yes. actually, he
(buy) his own flat next month,
a: (carol/come)
to the party last friday?
b: no. we
(not/see) her for three weeks.
4 a: brad and julie
(not/have) a holiday since 2005!
b: i know, but they
(visit) kenya this april.
5a:
(you/do) your homework yet, bill?
b: yes, mum. i
(already/finish) it.
a^2+a-30=0
a1+a2=-p=-1
a1*a2=q=-30
a1=5
a2=-6
x^2+4=5
x^2=5-4=1
x1=1
x2=-1
x^2+4=-6
x^2=-6-4=-10-посторонний корень.
2)(x^2-8)=a
a^2+3,5a-2=0
D=3,5^2-4*1*(-2)=12,25+8=20,25=4,5^2
a1=(-3,5+4,5)/2*1=1/2
a2=(-3,5-4,5)/2=(-8)
x^2-8=a1=1/2
x^2=1/2+8=0,5+8=8,5
x1=√8,5
x2=-√8,5
x^2-8=a2=-8
x^2=-8+8=0
x=0
3)(1-x^2)=a
a^2-3,7a+2,1=0
D=(-3,7)^2-4*1*2,1=13,69-8,4=5,69=2,3^2
a1=(-(-3,7)+2,3)/2*1=(3,7+2,3)/2=6/2
a1=3
a2=(-(-3,7)-2,3)/2=(3,7-2,3)/2=1,4/2
a2=0,7
1-x^2=a1=3
-x^2=3-1=2
x^2=-2-нет корней
1-x^2=a2=0,7
-x^2=0,7-1=-0,3
x^2=0,3
x1=√0,3
x2=-√0,3
4) (1+x^2)=a
a^2+0,5a-5=0
D=0,5^2-4*1*(-5)=0,25+20=20,25=4,5^2
a1=(-0,5+4,5)/2*1=4/2
a1=2
a2=(-0,5-4,5)/2=(-5)/2
a2=-2,5
1+x^2=a1=2
x^2=2-1=1
x1=1
x2=-1
1+x^2=a2=-2,5
x^2=-2,5-1=-3,5
x^2=-3,5-посторонний корень