Issolvi =22000/(1+r)^2-18000

$$= \frac { 22000 } { ( 1 + r ) ^ { 2 } } - 18000$$

Evalwa

$$\frac{2000\left(2-18r-9r^{2}\right)}{\left(r+1\right)^{2}}$$

Passi Qosra tas-Soluzzjonijiet

Biex iżżid jew tnaqqas l-espressjonijiet, espandihom biex id-denominaturi tagħhom ikunu l-istess. Immultiplika 18000 b'\frac{\left(1+r\right)^{2}}{\left(1+r\right)^{2}}.

$$\frac{22000}{\left(1+r\right)^{2}}-\frac{18000\left(1+r\right)^{2}}{\left(1+r\right)^{2}}$$

Billi \frac{22000}{\left(1+r\right)^{2}} u \frac{18000\left(1+r\right)^{2}}{\left(1+r\right)^{2}} għandhom l-istess denominatur, naqqashom billi tnaqqas in-numeraturi tagħhom.

$$\frac{22000-18000\left(1+r\right)^{2}}{\left(1+r\right)^{2}}$$

Agħmel il-multiplikazzjonijiet fi 22000-18000\left(1+r\right)^{2}.

$$\frac{22000-18000-36000r-18000r^{2}}{\left(1+r\right)^{2}}$$

Ikkombina termini simili f'22000-18000-36000r-18000r^{2}.

$$\frac{4000-36000r-18000r^{2}}{\left(1+r\right)^{2}}$$

Espandi \left(1+r\right)^{2}.

$$\frac{4000-36000r-18000r^{2}}{r^{2}+2r+1}$$

Espandi

$$-\frac{2000\left(9r^{2}+18r-2\right)}{\left(r+1\right)^{2}}$$

Passi Qosra tas-Soluzzjonijiet

Biex iżżid jew tnaqqas l-espressjonijiet, espandihom biex id-denominaturi tagħhom ikunu l-istess. Immultiplika 18000 b'\frac{\left(1+r\right)^{2}}{\left(1+r\right)^{2}}.

$$\frac{22000}{\left(1+r\right)^{2}}-\frac{18000\left(1+r\right)^{2}}{\left(1+r\right)^{2}}$$

Billi \frac{22000}{\left(1+r\right)^{2}} u \frac{18000\left(1+r\right)^{2}}{\left(1+r\right)^{2}} għandhom l-istess denominatur, naqqashom billi tnaqqas in-numeraturi tagħhom.

$$\frac{22000-18000\left(1+r\right)^{2}}{\left(1+r\right)^{2}}$$

Agħmel il-multiplikazzjonijiet fi 22000-18000\left(1+r\right)^{2}.

$$\frac{22000-18000-36000r-18000r^{2}}{\left(1+r\right)^{2}}$$

Ikkombina termini simili f'22000-18000-36000r-18000r^{2}.

$$\frac{4000-36000r-18000r^{2}}{\left(1+r\right)^{2}}$$

Espandi \left(1+r\right)^{2}.

$$\frac{4000-36000r-18000r^{2}}{r^{2}+2r+1}$$