Question 451662
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Hi
Note the use of ^ (uppercase 6 on Your keyboard)
  y = 3(x+5)(x-2)= 3({{{highlight(x^2+3x-10)}}}) = 3x^2 + 9x - 30
 (x+5)(x-2) Using Foil method of multiplying
F	First terms  x^2
O	Outside terms -2x
I	Inside terms   5x
L	Last terms    -10
                  {{{highlight( x^2 + 3x -10)}}}
OR
 (x+5)(x-2) = x(x-2) + 5(x-2) = x^2 -2x + 5x - 10 = {{{highlight(x^2 +3x - 10)}}}