quadratic equations...

Let the marks in maths=xx

marks in science =y

According to question,

x+y=30, which means that  y=30-x

If she'd got 2 marks more in maths it would have been=x+2

If she had got 3 marks more in scence it would have been =y+3

So,

(x+2)*(y+3)=210

So, we will have

(x+2)*(30-x+3)=210

(x+2)(33-x)=210