First ask yourselfhat needs to be dristributed. That would be -1 (x-9) To distribute you have to multiply the number out side of the parentheses (-1) by each term inside the parentheses( x and -9) -1×x=-x -1×-9=9 Now the expression is -x+9+4x To simplify you have to combine like terms (4x and-x) 4x-x=3x Your answer is 9+3x or 3(3+x).
