factorise a square minus 7 a + 12
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Step-by-step explanation:
Given, a2 - 7a + 12
=> a2 - (4+3)a + 12
=> a2 - 4a - 3a + 12
=> a (a - 4)-3(a - 4)
=> (a - 4)(a - 3)
i.e, a=4 & a=3
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