Square of a Difference
How to solve the square of a difference problems: formula, examples, and their solutions.
(a - b)2 = (a - b)(a - b).
By using the FOIL method,
(a - b)(a - b) = a2 - 2ab + b2.
So (a - b)2 = a2 - 2ab + b2.
See the brown (-) signs.
The (-) sign in (a - b)2
makes the middle term (-): -2ab.
It's the difference between
this formula and (a + b)2 formula.
Put x, (-), 7 into the formula.
Put 3r, (-), 2s into the formula.