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x²-x-42=(x+6)(x-7)
2x²+5x+3=(2x+3)(x+1)
2x²+10x-28=(2x-4)(x+7)
2x²+4x-48=(2x-8)(x+6)
6. L = 2x²-24x+70 = (2x-10).lebar
Jadi lebar = (x-7)
7. L = (2x+3)(3+x) = 6x+9+3x+2x²=2x²+9x+9
8.
Soal 1,3,4 tidak kelihatan jelas. semoga no 5,6,7,8 tidak salah soal.
Semangat!