Factor -4d 3 + 28d 2 - 4d. -4d(d2 - 7d + 1) -4(d2 - 7d + 1) -4(d3 - 7d2 + 1)

"-4d 3 + 28d 2 - 4d" might mean more to you as well as to others if typed as

-4d^3 + 28d^2 - 4d. The " ^ " symbol calls for exponentiation, whereas d 3 is meaningless.

Have a close look at -4d^3 + 28d^2 - 4d. Notice that -4d is a factor of every term? Thus, -4d^3 + 28d^2 - 4d = -4d(d^2 - 7d + 1. Now all we have to do is factor d^2 - 7d + 1

Actually, the factors -4d and d^2 - 7d + 1 are all we need, and the first answer is the correct one.

An important skill here is identifying common factors in a series of terms.

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step-by-step explanation:

percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

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