(X+2)(2X+3)
=(X×2X)+(X×3)+(2×2X)+(2×3)
=2X^2+3X+4X+6
=2X^2+7X+6
(3-Q)(-2-3Q)
=-(3×2)-(3×3Q)+(Q×2)+(Q×3Q)
=-6-9Q+2Q+3Q^2
=-6-7Q+3Q^2
(T+2)(-2T+5)
=-(T×2T)+(T×5)-(2×2T)+(2×5)
=-2T^2+5T-4T+10
=-2T+T+10
(-2Y-4)(-1-5Y)
=(2Y×1)+(2Y×5Y)+(4×1)+(4×5Y)
=2Y+10Y^2+4+20Y
=22Y+10Y^2+4
Explication :Appliquer la distributivité et réduire si possible.
