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Look for something which you can divide both terms by. In this case both 3x and 15 are divisible by 3, so put this outside of a bracket and write the two terms divided by the common factor inside the bracket. So the answer is 3(x+5).
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How do you factor the expression using gcf 9x plus 15?
3(3x + 5)
What is the factor of 3x plus 45 equals 24x?
3 is a factor and dividing by 3 gives x + 15 = 8x
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3x2 + 10x + 3 = (x + 3)(3x + 1).
How do you factor 9x squared plus 6x plus 1?
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