\frac{4.2\times4.2-1.9\times1.9}{2.3\times6.1}=?

Decimals and Fractions Practice Test 5

Question : 19 of 30

Marks: +1, -0

{4.2×4.2-1.9×1.9}/{2.3×6.1}=?

Solution:

{4.2×4.2-1.9×1.9}/{2.3×6.1}

={(4.2)^2-(1.9)^2}/{(4.2-1.9)(4.2+1.9)}

={{(4.2-1.9)(4.2+1.9)}}/{(4.2-1.9)(4.2+1.9)}=1

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