chavez8 chavez8

07-11-2019
Mathematics

contestada

For what value of r is the parallelogram a rhombus

For what value of r is the parallelogram a rhombus class=

Respuesta :

Fortunebolt Fortunebolt

09-11-2019

Answer:

9

Step-by-step explanation:

7r+18=r²

r²-7r-18=0

factorizing

r²+2r-9r-18=0

r(r+2)-9(r+2=0

(r-9)(r+2)=0

r-9=0

r=9

check

(r²)=(9*9)=81

7r+18=7(9) + 8=81

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