Question

Express as a perfect square and then find the value of:25m²-10m(5m+2n)+(5m+2n) when n= -2​

Answer 1

Answer:

2470

Explanation.:

25m^2 - 10m(5m+2n)^2

So,

25m * 25m=200

5m +2n

2n=2*n =4

Because n =2

So,5m+2n =9

Now,

200m - 10m * 9m+4

200m-10m (keep this as 1st side and remaining as 2nd side)

1st side

So let us subtract 10 from 200

200m-10=190

2nd side

Now we should add the sum

9m+4 =13

OK we are going to complete,

One last step,

Multiply the the product from both sides

190*13

Answer is 2470