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It is not clear what the 2, at the end of the expression is meant to indiacte.
(a + 6)(a + 4)
4(x+6)
It is: 3(x+2)
j
As written, that's 11a + 24, which is in its simplest form. If you meant a^2, that's (a + 6)(a + 4)
2x + 6 = 2(x+3)
(5x + 2)(x + 3)
(4x-3)(x+2)
It is 2(2x+3) when factorised
4
2x + 7 + 5 = 2x + 12 = 2*x + 2*6 = 2*(x+6)
2 x (2a + 3b - 6)