Question

cat face (3-x)•(x+6)
Stiu regula de inmultire dar nush cum vin semnele + si -

Answer 1

$(3 - x)(x + 6) \\ = 3 \times x + 3 \times 6 + ( - x) \times x + ( - x) \times 6 \\ = 3x + 18 - {x}^{2} - 6x \\ = - {x}^{2} - 3x + 18$

Answer 2

$(3 - x)(x + 6) = 3(x + 6) - x(x + 6) = 3x + 18 - {x}^{2} - 6x = - {x}^{2} - 3x + 18$