Ta có: \(\left(4x+2\right)\left(7-3x\right)+\left(x-5\right)\left(12x+4\right)\)
\(=28x-12x^2+14-6x+12x^2+4x-60x-20\)
\(=-34x-6\)
(4x+2)(7−3x)+(x−5)(12x+4)(4x+2)(7−3x)+(x−5)(12x+4)
= 28x−\(12x^2\)+14−6x+\(12x^2\)+4x−60x−2
= \(-12x^2+12x^2+28x-6x-60x+14-2\)
= \(-34x-6\)
Vậy kết quả là -34x-6