Ответ:
а) \((b-3c)(b+3c)=b^2-(3c)^2=b^2-9c^2\).
б) \(4(x+5)-(x-6)^2=4x+20-(x^2-12x+36)=-x^2+16x-16\).
в) \(36x^2-(-4-x)^2=36x^2-(x+4)^2=36x^2-(x^2+8x+16)=35x^2-8x-16\).
Ответ: а) \(b^2-9c^2\); б) \(-x^2+16x-16\); в) \(35x^2-8x-16\).
а) \((b-3c)(b+3c)=b^2-(3c)^2=b^2-9c^2\).
б) \(4(x+5)-(x-6)^2=4x+20-(x^2-12x+36)=-x^2+16x-16\).
в) \(36x^2-(-4-x)^2=36x^2-(x+4)^2=36x^2-(x^2+8x+16)=35x^2-8x-16\).
Ответ: а) \(b^2-9c^2\); б) \(-x^2+16x-16\); в) \(35x^2-8x-16\).