How do you simplify #3+ 4( 2x ^ { 3} ) + 2( - 2x + 5)- 21#?

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Answer 1 · 2017-10-06T21:54:46

#8x^3-4x-8#

Following order of operations, we have to multiply before we add or subtract.

So,

#3+color(red)(4(2x^3))+color(red)(2(-2x+5))-21#

#=3+color(red)(8x^3)+color(red)(-4x+10)-21#

Now add like terms:

#3+10-21+8x^3-4x=-8+8x^3-4x#

Usually we write the answer with the highest power first, so:

#8x^3-4x-8#