factorise -20x²

Question

factorise -20x² - 9x + 20

Options:

A . (5 - 4x)(4 - 5x)

B . (5 - 4x)(4 + 5x)

C . (5 + 4x)(4 - 5x)

D . (5 + 4x)(4 + 5x)

Answer: Option C
Explanation :

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