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OpenStudy (anonymous):
Which expression represents the area of the rectangle? A) 4x2 + 19x + 17.5 B) 6x2 + 38x + 17.5 Eliminate C) 8x2 + 38x + 35 D) 12x + 24 http://www.usatestprep.com/modules/gallery/files/18/1843/1843.png
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OpenStudy (trojanpoem):
B)
OpenStudy (trojanpoem):
(2x + 7)(4x+ 5) = 8 x^2 + 38 x + 35 divide by 2 4x^2 + 19 x + 17.5
OpenStudy (anonymous):
please explain this to me i dont understand were you got 38x
OpenStudy (trojanpoem):
fine , to multiply ( 2x+ 7) (4x+5 ) you multiply 2x * 4x and 2x* 5 , 7 * 4x , 7 * 5 now you have 2x*5 and 7*4x = 10 x + 28 x = 38 x 2x* 4x = 8 x*x = 8 x^2 7 * 5= 35
OpenStudy (anonymous):
alright thank you
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OpenStudy (trojanpoem):
YW
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