Dear teacher ,
I have a doubt regarding the below shared question that in the third step we got 4x^2 + 28xy + 49 y^2 so 4 we got when we solved the above equation that 2x^2 and same goes for 7y^2 , but why still we write 4x^2 and 49 y^2 in the solution shouldn't it be written simply 4x and 49 y
And the final answer be like 4x + 28 xy + 49y
So my overall doubt is why are we still squaring the numbers in our solution if we already got the solution by squaring in the above step like (2x)^2 = 4x