Algebraic expressions and identities:
HOW TO SOLVE (9.9)^2 and (8.9)^2
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9.9=(10-0.1)^2
=100-(2*10*0.1)+0.01
=100-2+0.01
=98.01
8.9=(10-1.1)^2
=100-22+1.21
=78.21
^____^
=100-(2*10*0.1)+0.01
=100-2+0.01
=98.01
8.9=(10-1.1)^2
=100-22+1.21
=78.21
^____^
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