Multiply
(a) (5x2 + x -10) by (x2 +4x -9)
(b) (9x2 +8x -6) by (x2 - 9)
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Answer:
a) 5x⁴ + 21x³ -51x² - 9x +90
b) 9x⁴ + 8x³ - 87x² - 72x + 54
Step-by-step explanation:
a) 5x² + x -10) x (x² +4x -9)
sol. 5x⁴ + x³ - 10x² +20x³ + 4x² -40x -45x² -9x + 90
5x⁴ + 21x³ -51x² - 9x +90
b) (9x² +8x -6) x (x² - 9)
sol. 9x⁴ + 8x³ -6x² -81x² -72x + 54
9x⁴ + 8x³ - 87x² - 72x + 54
*_*
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