Respuesta :

b is the correct answer
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Use: (a + b)(c + d) = ac + ad + bc + bd

[tex](2r-5)(r+10)=(2r)(r)+(2r)(10)+(-5)(r)+(-5)(10)=2r^2+20r-5r-50=2r^2+15r-50[/tex]

Answer: b. 2r² + 15r - 50

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