Question

12. n[15 - n (2n + 5) (n-3) + n{-15 - 7n (n - 4)} +18] + -​

Answer 1

EXPLANATION

n[15-n(2n+5)(n-3+n{-15-7n(n-4)}+18

15n-n(2n+5)(n-3+n{-15-7n(n-4)}+18

14n (2n+5)(n-3+n{-15-7n(n-4)}+18

33n(n-3+n{-15-7n(n-4)}+18

31n{-15-7n(n-4)}+18

{-22n(n-4)}+18

-22n-4+18

-26n+18

-8n

FINAL ANSWER

-8n

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Answer 2

Answer:

-9n⁴ + 29n³ + 33n

Step-by-step explanation:

n[15 - n (2n + 5) (n-3) +n { -15 - 7n (n-4)} + 18]

n[15 - (2n² + 5n) (n-3) + n { -15 - 7n² + 28n} + 18]

n[ 15- (2n³ - 6n² + 5n² + 15n)-15n - 7n³ + 28n² +18]

n[15 - 2n³ + 6n² - 5n² +15n -15n - 7n³ + 28n² + 18]

n[-9³ + 29² + 33]

= -9n⁴ + 29n³ + 33n