if you mean a number when multiplied by -15 will give you +2, then the answer is -15 times x=2 divide both sdies by -15 x=2/-15=-1/7.5
x=1/7.5
or if you mean what 2 number multily to get -15 and add to get 2, then the numbers are -3 and 5 when multiplied they give-15 when added together they give 2
