find the answer correctly for 14th question
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Step-by-step explanation:
a)16²-15²
=16²-(16-1)²
=16²-[16²+1²-2×16×1)
=16²-16²-1+32
=31
b)524²-523²
=524²-(524-1)²
=524²-[524²+1²-2×524×1]
=524²-524²-1+1048
=1047
c)75²
=(70+5)²
=70²+5²+2×70×5
=4900+25+700
=5625
d)95²
=(90+5)²
=90²+5²+2(90)(5)
=8100+25+900
=9025
e)5²+6²+30²
=5²+6²+(5×6)²
=25+36+(25×36)
=25+36+900
=961
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