use appropriate property to find (a+b+c)^2-(a-b-c)^2 =4a(b+c)
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(a+b+c)^2-(a-b-c)^2
=(a+b+c+a-b-c)(a+b+c-a+b+c)
=2a(2b+2c)
=2a × 2 (b+c)
=4a(b+c)
=(a+b+c+a-b-c)(a+b+c-a+b+c)
=2a(2b+2c)
=2a × 2 (b+c)
=4a(b+c)
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