Question

(8r2-7r-9)+(-r2+r)
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Answer 1

Respuesta:

$8r-9$

Explicación paso a paso:

$8r\cdot \:2-7r-9-r\cdot \:2+r$

$8\cdot \:2r-7r-2r+r-9$

$8\cdot \:2r-8r-9$

$16r-8r-9$

$8r-9$