Solve the equation if X = 3
3X2 - 21/3X =
48
20
12
6
Correct Answer : D
Use substitution method to determine the value of the given expression. Use 3 in place of X in the given expression.
\(3X^2-\frac{21}{3}X\)
In place of X insert 3
\(3\left(3\right)^2-\frac{21}{3}\left(3\right)=3\left(9\right)-21=27-21=6\)
When X=3, the equation reduces to 6.
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We use dimension analysis to find the number of diapers the child uses in a year. In a day, the mother uses 6 diapers and a year has 365 days. Then, the number of diapers in one year becomes:
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