x(5-x) +(1,2+x)(x-1,2)

5x-x^2+x^2-1.44=5x-1.44

5x - {x}^{2} + (x+1.2)*(x-1.2)
5x - {x}^{2} + {x}^{2} - {1.2}^{2}
5x - {\binom{6}{5}}^{2}
5x - \frac{36}{25}