C-03-Q070mediumsingle_mcqa2+6a+9=?a^2 + 6a + 9 = ?a2+6a+9=?a(a+3)2(a+3)^2(a+3)2b(a−3)2(a-3)^2(a−3)2c(a+3)(a−3)(a+3)(a-3)(a+3)(a−3)d(a+6)(a+3)(a+6)(a+3)(a+6)(a+3)