1.

Factorise -20x 2; - 9x + 20

A. (5 + 4x)(4 - 5x)
B. (5 - 4x)(4 - 5x)
C. (5 - 4x)(4 + 5x)
D. (5 + 4x)(4 + 5x)
Answer» B. (5 - 4x)(4 - 5x)


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