What shows 23^2-17^2 being evaluated using the difference of perfect squares method

asked Dec 26, 2018 212k views

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7 votes

23^2 - 17^2
= (23-17)(23+17)
= 6 * 40
= 240

Oshri answered Dec 27, 2018

by Oshri

9.0k points

4 votes

remember
a²-b²=(a-b)(a+b)

so
23²-17²=(23-17)(23+17)=(6)(40)=240

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