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=(5x -2)(4x -7)
=20x²-35x-8x-14
=20x²-43x-14...........b
16.(3a-4b)(3a-4b)
=9a²-12ab-12ab+16b²
=9a²-24ab+16b²...........d
17.3(x-1/x)(x-1/x)
=3(x²-1-1+1/x²)
=3(x²-2+1/x²)
=3x²-6+3/x²...................c
18.(3b-2)(3b-2)-(b-3)(b-3)
=(9b²-6b-6b+4)-(b²-3b-3b+9)
=(9b²-12b+4)-(b²-9b+9)
=9b²-12b+4-b²+9b-9
=8b²-6b-5...........................b