Question

find
a.(x-8)^2 +(x+8)^2
b.(10+2)^2 -(10-2)^2
c.(x+y)^2 -(x-y)^2​

Answer 1

Answer:

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Answer 2

using identity

a-b²=a²+b²-2ab

a+b²=a²+b²+2ab

a.(x-8)²+(x+8)²=(x²+64-16x)+(x²+64+16x)

=2x²+128

b.(10+2)²-(10-2)²=(100+4+40)-(100+4-40)

=100+4+40-100-4+40

=80

c.(x+y)²-(x-y)²=x²+y²+2xy-(x²+y²-2xy)

=x²+y²+2xy-x²-y²+2xy

=4xy