24x6 + 12x4 + 15x2 factor the greatest common factor, 3x2
= 3x2(8x4 + 4x2 + 5)
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15x2-13x+2 = (5x-1)(3x-2) when factored
48
Oh, dude, it's like this - you gotta find two numbers that multiply to -225 (15 * -15) and add up to 16. So, the numbers are 25 and -9. Then you can rewrite the equation as (5x + 25)(3x - 9). And that's how you factor it, easy peasy!
20x3-15x2=8,000-225=7,775
15x2=30