Algebra 3
1 mark · EasyWrite down an algebraic identity that uses the difference of two squares.
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a^2 - b^2 = (a - b)(a + b)
Also accept: x^2 - y^2 = (x - y)(x + y)
Common mistakes: Incorrect expansion such as (a-b)^2
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Marking points
B1 · 1 mark · States a correct identity using the difference of two squares, in either variable.
Worked solution
A standard difference of squares identity is: