Question
If $$y = 5{\text{,}}$$ then what is the value of $$10y\sqrt {{y^3} - {y^2}} $$ = ?
Answer: Option D
$$\eqalign{
& = 10y\sqrt {{y^3} - {y^2}} \cr
& = 10 \times 5\sqrt {{5^3} - {5^2}} \cr
& = 50 \times \sqrt {125 - 25} \cr
& = 50 \times \sqrt {100} \cr
& = 50 \times 10 \cr
& = 500 \cr} $$
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$$\eqalign{
& = 10y\sqrt {{y^3} - {y^2}} \cr
& = 10 \times 5\sqrt {{5^3} - {5^2}} \cr
& = 50 \times \sqrt {125 - 25} \cr
& = 50 \times \sqrt {100} \cr
& = 50 \times 10 \cr
& = 500 \cr} $$
Was this answer helpful ?
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