What is the quadratic power of (a + b) + 2 (a + b) + 1 To write out the calculation process, what operations are used, we should use the formula method

What is the quadratic power of (a + b) + 2 (a + b) + 1 To write out the calculation process, what operations are used, we should use the formula method

(a+b)^2+2(a+b)+1 =[(a+b)+1]^2 =(a+b+1)^2