ПОМОГИТЕ ПОЖАЛУЙСТА

Знайдіть помилки і запишіть правильно.
1) y2-4 = (y-4)(y+4)
2) 6*x-30=6(x-6)
3) x2+x= x(x+x)
4) x2+6x+9=(x-3)2
5) 9-b2=(3-b)(2+b)
6) 2x+8 = (x+4)
7) x2+14x+49 =(x+7)
8) m3+8 = (m+2) (m2+2m+2)
9) 9x2-16 =(3x-8)(3x+8)
10) x2+4=(x+2)(x-2)
11) 9y2-12xy+4x2=(3y+4)2
12) 5x2+5x=5x*x+1​
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