(5x - 3)(3x + 5)
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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!
No, 30 is a multiple of 15.
(x - 15)(x - 1)
The given expressions can be simplified to: 16x-10
It will be: 6x2 +8x -15