Issolvi 9left(n-2yright)^2-4left(n-2yright)-13

$$9 { \left(n-2y \right) }^{ 2 } -4 \left( n-2y \right) -13$$

Evalwa

$$\left(-18y+9n-13\right)\left(1+n-2y\right)$$

Passi tas-Soluzzjonijiet

Uża teorema binomjali \left(a-b\right)^{2}=a^{2}-2ab+b^{2} biex tespandi \left(n-2y\right)^{2}.

$$9\left(n^{2}-4ny+4y^{2}\right)-4\left(n-2y\right)-13$$

Uża l-propjetà distributtiva biex timmultiplika 9 b'n^{2}-4ny+4y^{2}.

$$9n^{2}-36ny+36y^{2}-4\left(n-2y\right)-13$$

Uża l-propjetà distributtiva biex timmultiplika -4 b'n-2y.

$$9n^{2}-36ny+36y^{2}-4n+8y-13$$

Espandi

$$36y^{2}-36ny+8y+9n^{2}-4n-13$$

Passi tas-Soluzzjonijiet

Uża teorema binomjali \left(a-b\right)^{2}=a^{2}-2ab+b^{2} biex tespandi \left(n-2y\right)^{2}.

$$9\left(n^{2}-4ny+4y^{2}\right)-4\left(n-2y\right)-13$$

Uża l-propjetà distributtiva biex timmultiplika 9 b'n^{2}-4ny+4y^{2}.

$$9n^{2}-36ny+36y^{2}-4\left(n-2y\right)-13$$

Uża l-propjetà distributtiva biex timmultiplika -4 b'n-2y.

$$9n^{2}-36ny+36y^{2}-4n+8y-13$$