(2a + 10)(2a - 12)
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Assuming the missing signs are pluses, that factors to (4a + 3)(a + 3)
4a2+ 25 does not factor over the real number field. In the complex numbers , it factors as (2a +5i)(2a - 5i). This is because i2 = -1, so 4a2 + 25 = 4a2 - (- 25) = 4a2 - 25(-1) = 4a2 - 25i2
2a
4(4a2 - b2) 4(2a + b)(2a - b)
Oh, dude, the Greatest Common Factor (GCF) of 4a and 10a is 2a. It's like the cool kid that both 4a and 10a can hang out with without any drama. So, if 4a and 10a were at a party, 2a would be the one they both vibe with.