A. 4x( 5x^2 -2x +3) B. X(4x^3 – 5xy +2x) C. 89^2 +22.89+11^2

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1. `A = 4x.(5x^2-2x+3)`
   `=20x^3+8x^2+12x`
   `B=x(4x^3-5xy+2x)`
   `=4x^4-5x^2y+2x^2`
   `C = 89^2+22.89+11^2`
   `=89^2+2.11.89+11^2`
   `=(89+11)^2=100^2=10000`

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