1. (x+5) x (5x-1) = 2.(7-2x) x (2x-7) =

1.(x+5)(5x-1)
=5x²-1x+25x-5
=5x²+24x-5

2.(7-2x)(2x-7)
=14x-49-4x²+14x
=14x+14x-4x²-49
=28x-4x²-49

1. (x+5) × (5x-1)
=5x²-x+25x-5
=5x²+24x-5

2. (7-2x) x (2x-7)
=14x-49-4x²+14x
=28x-49-4x²
=-4x²+28x-49