x^4-9x-20 facterisation
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= (x²)² - 5x - 4x - 20
= (x² - 5)(x² - 4)
4 = 2²:
= (x² - 5)(x² - 2²)
a² - b² = (a + b)(a - b):
= (x² - 5)(x + 2)(x - 2)
Answer: (x² - 5)(x + 2)(x - 2)
ankitguthliya:
wt is this??
hmmm...sounds good.....its ok:
okay
answer is not correct
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