Помогите пожалуйста. Упростите выражение. (m+4)^2-4(m+1)^2.
5(3-5x)^2-5(3x-7)(3x+7).
(x-1)^2-4(x+1)^2-6(x+1)(x-1)
5(3-5x)^2-5(3x-7)(3x+7).
(x-1)^2-4(x+1)^2-6(x+1)(x-1)
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5(3-5x)^2-5(3x-7)(3x+7)=5(9-30x+25x^2)-5(9x^2-49)=45-150x+125x^2-45x^2+245=80x^2-150x+300
(x-1)^2-4(x+1)^2-6(x+1)(x-1)=x^2-2x+1-4(x^2+2x+1)-6(x^2-1)=x^2-2x+1-4x^2-8x-1-6x^2+6=-9x^2-10x+6