Question

(2x+3y+9) (2x+3y-9)
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Answer 1

Respuesta:

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(2x+3y+9)(2x+3y−9)

=(2x+3y+9)(2x+3y+−9)

=(2x)(2x)+(2x)(3y)+(2x)(−9)+(3y)(2x)+(3y)(3y)+(3y)(−9)+(9)(2x)+(9)(3y)+(9)(−9)

=4x²+6xy−18x+6xy+9y²−27y+18x+27y−81

=4x²+12xy+9y²−81

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Explicación paso a paso: