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Find the value of the products: (x+2y)(...

Find the value of the products: `(x+2y)(x-2y)a t\ x=1,\ y=0`

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`(x+2y)(x-2y)`
`x(x-2y)+2y9x-2y)`
`x^2-2xy+2xy-2y^2`
`x^2-4y^2`
`where x=1,y=0`
`x^2-4y^2`
`1^2-4(0)^2`
`1-0`
`1`
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