Question 670208
FOIL the first two, the the third.
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(2x(2x) + 2x(7) + 2x(7) + 7(7))(2x+7)
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{{{(4x^2 + 28x + 49)(2x+7)}}}
...
{{{2x(4x^2) + 2x(28x) + 2x(49) + 7(4x^2) + 7(28x) + 7(49)}}}
{{{8x^3 + 56x^2 + 98x + 28x^2 + 196x + 343}}}
Combine like terms
{{{highlight_green(8x^3 + 84x^2 + 294x + 343)}}}
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