I'm not too sure what you trying to ask in 61 a & bbut I can help you with #56(3x2+11x-20 ) / (2x2+11x+5)= (3x2+ 15x â€“ 4x -20 ) / (2x2+10x+ 1x +5)= [3x(x+5) â€“ 4(x+5) ] / [ 2x (x+5) + 1 (x+5)]= (3x - 4) /(2x + 1)Setting both sides equal to zero and then simplifying it more= 3x- 4 = 0 and 2x +1 = 0= 3x = 4 and 2x = -1= x 4/3 and x = -1/2 Setting X = to these values will give us a zero in the denominator and the numerator. And hence X cannot be equal to 4/3 and -1/2 Hope this helps