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b. 5x²-x+25x-5=5x²+24x-5
c. 14x-46-4x²+14x
=(10.2y)-(10.10)
=20y-100
b.(x+5)(5x-1)
=(x.5x)-(x.1)+(5.4x)-(5.1)
=5x²-x+20x-5
=5x²+19x-5
c.(7-2x)(2x-7)
=(7.2x)-(7.7)-(2x.2x)+(2x.7)
=14x-49-4x²+14x
=28x-49-4x²