(X-1)(X+2)-(5X+3)(1-3X)
=(X×X)+(X×2)-(1×X)-(1×2)
=X^2+2X-X-2
=X^2+X-2
=X^2+X-2 -(5X×1)-(5X×3X)+(3×1)-(3×3X)
=X^2X-2-(5X-15X^2+3-9X)
=X^2+X-2-5X+15X^2-3+9X
=16X^2+5X-5
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(X-1)(X+2)-(5X+3)(1-3X)
=(X×X)+(X×2)-(1×X)-(1×2)
=X^2+2X-X-2
=X^2+X-2
=X^2+X-2 -(5X×1)-(5X×3X)+(3×1)-(3×3X)
=X^2X-2-(5X-15X^2+3-9X)
=X^2+X-2-5X+15X^2-3+9X
=16X^2+5X-5