Explicación paso a paso:
a. (x+2)(3x-1)
= 3x^2 -x +6x -2
= 3x^2 +5x -2
b. (x+5)(4x-3)
= 4x^2 -3x +20x -15
= 4x^2 +17x -15
c. (2x+1)(3x-5)
= 6x^2 - 10x +3x -5
= 6x^2 -7x -5
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Explicación paso a paso:
a. (x+2)(3x-1)
= 3x^2 -x +6x -2
= 3x^2 +5x -2
b. (x+5)(4x-3)
= 4x^2 -3x +20x -15
= 4x^2 +17x -15
c. (2x+1)(3x-5)
= 6x^2 - 10x +3x -5
= 6x^2 -7x -5