Question

(3x-4y-5)^2
expand the following ​

Answer 1

Step-by-step explanation:

Using formula:-

$( {x}^{2} - {y}^{2} - {z}^{2} ) = {x}^{2} + {y}^{2} + {z}^{2} - 2 xy + 2yz - 2zx$

Now

$= > ({3x})^{2} + ( {4y})^{2} - {5}^{2} - 2.3x.4y + 2.4y.5 - 2.5.3x \\ = > {9x}^{2} + {16y}^{2} + {25} - 24xy + 40y - 30x$