Question 342932
3x(a-3)-5(3-a) 
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3x(a-3)+5(a-3)
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(a-3)(3x+5)
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20x^2-7x-6. 
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20x^2-15x+8x-6
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5x(4x-3)+2(4x-3)
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(4x-3)(5x+2)
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4x^4 + 12x^3- 28x^2
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4x^2[x^2+3x-7]
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Cheers,
Stan H.
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