Ответ учителя по предмету Алгебра
1) x2+7x+10=0
2x+7x+10=0
9x+10=0
9x=-10
x=(-10)÷9
x=-10/9
2) -x2+8x-52=0
-2x+8x-52=0
6x-52=0
6x=52
x=52÷6
x=26/3
3) -x2-4x-3=0
-2x-4x-3=0
-6x-3=0
-6x=3
6x=-3
x=(-3)÷6
x=-1/2
4) -x2-14-50=0
x=-32
5) x2-12x+29=0
x=29/10
6) -x2+4x+5=0
x=-5/2
7) -x2+8x-9=0
x=3/2
8) x2-4x-2=0
x=-1
9) x2+3x-4=0
x=4/5
10) x2-14x+49=0
x=49/12
11) x2+4x+20=0
x=-10/3
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0,084 : ( 6,2 — х ) = 1,2
За раннее спасибо…
y: … 5,5 ;130; …