Simplify: $(a + 1) (a - 2) - 2 a + 4$ $(a+1)(a-2)-2a+4$ ?

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Answer 1 · 2017-07-26T13:18:46

$(a - 2) (a - 1)$ $(a-2)(a-1)$

Expression $= (a + 1) (a - 2) - 2 a + 4$ $= (a+1)(a-2)-2a+4$

Expand the product:

$= a^{2} + a - 2 a - 2 - 2 a + 4$ $= a^2+a-2a-2 -2a+4$

Combine like terms:

$= a^{2} - 3 a + 2$ $= a^2-3a+2$

Factorise:

$= (a - 2) (a - 1)$ $= (a-2)(a-1)$

Simplify: (a+1)(a−2)−2a+4(a+1)(a-2)-2a+4 ?