The value of (5x-3y)square - ( 5x+ 3y) square when x = -1 and y =1/5
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(5x-3y)^2=5(-1)-3(1/5)^2
=-5-3/5
=-5.6^2
=(-5.6)(-5.6)
=31.36
now, (5x+3y)^2=5(-1)+3/5
=3/5-5^2
=-4.4^2
=(-4.4)(-4.4)
=19.36
again 5x-3ysqure-5x+3y
=31.36-19.36
=12
=-5-3/5
=-5.6^2
=(-5.6)(-5.6)
=31.36
now, (5x+3y)^2=5(-1)+3/5
=3/5-5^2
=-4.4^2
=(-4.4)(-4.4)
=19.36
again 5x-3ysqure-5x+3y
=31.36-19.36
=12
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