(2x²-x-8)(7x²+9x+5)
= 14x⁴ + 11x³ - 55x² - 77x - 40
that's it! ;)
(2x² - x - 8)(7x² + 9x + 5) = 2x²(7x² + 9x + 5) - x(7x² + 9x + 5) - 8(7x² + 9x + 5) =
14x⁴ + 18x³ + 10x² - 7x³ - 9x² - 5x - 56x² - 72x - 40 = 14x⁴ + 11x³ - 55x² - 77x - 40
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(2x²-x-8)(7x²+9x+5)
= 14x⁴ + 11x³ - 55x² - 77x - 40
that's it! ;)
(2x² - x - 8)(7x² + 9x + 5) = 2x²(7x² + 9x + 5) - x(7x² + 9x + 5) - 8(7x² + 9x + 5) =
14x⁴ + 18x³ + 10x² - 7x³ - 9x² - 5x - 56x² - 72x - 40 = 14x⁴ + 11x³ - 55x² - 77x - 40