Question

Halla el área de las siguientes figuras ​

Answer 1

Respuesta:

$A.\\A = (2x-y)(2x+y) = 4x^2+2xy-2xy-y^2\\\\A = \frac{4x^2+2xy-2xy-y^2}{2} = 2x^2+xy-xy-\frac{y^2}{2} \\\\A = 2x^2-\frac{y^2}{2}\\\\B.\\A= (7x-7y)(7x+7y) = 49x^2+49xy-49xy+49y^2 = 49x^2-49y^2\\\\C.\\A =(4x-5y)(4x+5y) = 16x^2+20xy-20xy-25y^2 = 16x^2-25y^2\\\\D.\\A = (5x-5)(5x+5) = 25x^2+25x-25x-25 = 25x^2-25$