Find the value of a square - 2Ab + b square If a squared - AB = 5. B squared - AB = 4

Find the value of a square - 2Ab + b square If a squared - AB = 5. B squared - AB = 4

A squared - AB = 5 -- 1
Bsquare - AB = 4 -------- 2
1 + 2 gives a square - 2Ab + b square equals 9

If a + B = 4, then the value of A2 + 2Ab + B2 is______ ．

∵ a + B = 4, ∵ A2 + 2Ab + B2 = (a + b) 2 = 16

Remove brackets: the square of 3B - (the square of a + the square of B) - the square of B

The square of 3B - (the square of a + the square of B) - the square of B
=The square of 3B - the square of a - the square of B - the square of B
=-The square of a + (the square of 3B - the square of B - the square of B)
=-Square of a + B
In this problem, you need to first remove the minus sign outside the brackets and the brackets, and then add a - sign to the square of a, and then change the plus sign inside the original brackets into a minus sign, a minus sign into a plus sign, and then merge the similar items to get the result