Question

2x mũ 2 trừ 5x trừ 7

Answer 1

\(2x^2-5x-7\)

\(=2x^2-2x+7x-7\)

\(=2x.\left(x-1\right)+7.\left(x-1\right)\)

\(=\left(2x+7\right).\left(x-1\right)\)

Answer 2

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\(2x^2-5x-7\)

\(=2x^2+2x-7x-7\)

\(=2x.\left(x+1\right)-7.\left(x+1\right)\)

\(=\left(2x-7\right).\left(x+1\right)\)

Answer 3

2x² - 5x - 7

= 2x² + 7x - 2x - 7

= ( 2x² - 2x ) + ( 7x - 7 )

= 2x( x - 1 ) + 7( x - 1 )

= ( 2x + 7 )( x - 1 )