1) f (X)= (2x+3)^2 -5 (2x+3)(5-x) =4x^2+12x+9 -(10x+15)(5-x) =4x^2+12x+9-50x+10x^2-75+15x = 14x^2-23x-66
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1) f (X)= (2x+3)^2 -5 (2x+3)(5-x) =4x^2+12x+9 -(10x+15)(5-x) =4x^2+12x+9-50x+10x^2-75+15x = 14x^2-23x-66