Упростите выражение:
1)(b-6) (b+6)-3b(b+2)
2)(3a-2) (3a+2)+(a-8) (a+8)
3)(5x-3y) (5x+3y)+(3x-5y) (3x+5y)
4)(c-2) (3-c)-(5-c) (5+c)
1)(b-6) (b+6)-3b(b+2)
2)(3a-2) (3a+2)+(a-8) (a+8)
3)(5x-3y) (5x+3y)+(3x-5y) (3x+5y)
4)(c-2) (3-c)-(5-c) (5+c)
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2)9a^2-4+a^2-64=10a^2-68
3)25x^2-9y^2+9y^2-25x^2=0
4)3c-c^2-6+2c-25+c^2=5c+25=5(c+5)