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Simplify the following expression in $x$:\[2x+8x^2+9-(4-2x-8x^2).\]

 

Express your answer in the form $ax^2 +bx+c$, where $a$, $b$, and $c$ are numbers.

 Sep 21, 2019
 #1
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2x + 8x+ 9 - (4 - 2x - 8x2)

 

There is a negative 1 before the parantheses

 

2x + 8x2 + 94 + 2x + 8x2

 

Which simplifies to

 

16x2 + 4x + 5

 Sep 22, 2019

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