plz solve this sum :
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use the formula...
a^2-b^2=(a-b)(a+b)
a) 68^2-67^2=(68-67)(68+67)
=1 x 135 = 135
b)110^2-109^2=(110-109)(110+109)
=1 x 219 =219
c)555^2-554^2=(555-554)(555+554)
= 1 x 1109=1109
d)221^2-220^2=(221-220)(221+220)
=1 x 441=441
are the answers...
a^2-b^2=(a-b)(a+b)
a) 68^2-67^2=(68-67)(68+67)
=1 x 135 = 135
b)110^2-109^2=(110-109)(110+109)
=1 x 219 =219
c)555^2-554^2=(555-554)(555+554)
= 1 x 1109=1109
d)221^2-220^2=(221-220)(221+220)
=1 x 441=441
are the answers...
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