( x + 10 ) 2 = x 2 + 20 x + 100
( x + 10 ) 2
(x+10)(x+10)
x 2 + 20 x + 100
To simplify ( x + 10 ) 2 , use the formula for squaring a binomial. The result is x 2 + 20 x + 100 . This is achieved by calculating the square of both terms and doubling their product.
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[tex] \frac{105}{300} \times 100\% \\ \\ = 0.35 \times 100\% \\ = 35\%[/tex]Jadi jawabannya C.