Question

Rohan had 17x² + 4x -3 with him .he spent 8x² - 7x - 9 rupees for his birthday . how much money is left with him ?

Answer 1

$$\begin{gathered} \mathrm{Total}\mathrm{money}\mathrm{with}\mathrm{Rohan}=\mathrm{Rs}\left[17{\mathrm{x}}^2+4\mathrm{x}-3\right] \\ \mathrm{Money}\mathrm{spent}\mathrm{on}\mathrm{birthday}=\mathrm{Rs}\left[8{\mathrm{x}}^2-7\mathrm{x}-9\right] \\ \mathrm{Money}\mathrm{left}=\mathrm{Rs}\left[\left(17{\mathrm{x}}^2+4\mathrm{x}-3\right)-\left(8{\mathrm{x}}^2-7\mathrm{x}-9\right)\right] \\ =\mathrm{Rs}\left[17{\mathrm{x}}^2+4\mathrm{x}-3-8{\mathrm{x}}^2+7\mathrm{x}+9\right] \\ =\mathrm{Rs}\left[9{\mathrm{x}}^2+11\mathrm{x}+6\right] \end{gathered}$$