Hi

Note the use of ^ (uppercase 6 on Your keyboard)

  y = 3(x+5)(x-2)= 3() = 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

                  

OR

 (x+5)(x-2) = x(x-2) + 5(x-2) = x^2 -2x + 5x - 10 =  

 

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