Integration OCR MEI A-level Maths

Will I get full marks for showing the indefinite integral and then equating it to F(x) then substituting in my limits to find area? (e.g. indefinite integral: [2x]=F(x), area: F(2) - F(1) =2)

This is how I show my working usually but my maths teacher takes away several marks just because I don't write out the substitution in full... Then she showed me the mark scheme which looked exactly like my working.

Please help me