how to solve (7.8+2.2)(7.8-2.2)
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Answered by
8
ANSWER :
_________
( 7.8 + 2.2 )( 7.8 - 2.2 )
=> ( 10.0 ) (5.6 )
=> 56
Alternate method :
________________
Using identity, a^2 - b^2 = ( a + b )( a - b )
=> ( 7.8 ) ^2 - ( 2.2 ) ^2
=> 60. 84 - 4.84
=> 56.00 = 56
_________
( 7.8 + 2.2 )( 7.8 - 2.2 )
=> ( 10.0 ) (5.6 )
=> 56
Alternate method :
________________
Using identity, a^2 - b^2 = ( a + b )( a - b )
=> ( 7.8 ) ^2 - ( 2.2 ) ^2
=> 60. 84 - 4.84
=> 56.00 = 56
Anonymous:
Thanks
Answered by
2
sol = (7.8)to power 2 - (2.2) to power 2 [ by using formula (a+b) (a-b) =a square - b square ]
then, = 60.84 -4.84
= 56 Ans
then, = 60.84 -4.84
= 56 Ans
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