WAEC - Mathematics (2002 - No. 36)

Factorize m(2a-b)-2n(b-2a)
(2a-b)(2n-m)
(2a+b)(m-2n)
(2a-b)(m+2n)
(2a-b)(m-2n)

Explanation

m(2a - b) - 2n(b - 2a)

= m(2a - b) - (-2n)(2a - b)

= m(2a - b) + 2n(2a - b)

= (m + 2n)(2a - b)

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