My brother is 5 years older than me. my sister is 3 years younger than me how old will my sister be when my brother is 29?

The answer is 21 because all you have to do is subtract how much older you and your brother are to her which would be 8 years.

So all you have to do:

29 - 8 = 21

- 2 + 10x³ - 21x² + 19x - 4

step-by-step explanation:

each term in the second factor is multiplied by each term in the first factor

x²(- 2x² + 4x - 1) - 3x(- 2x² + 4x - 1) + 4(- 2x² + 4x - 1) ← distribute

= - 2 + 4x³ - x² + 6x³ - 12x² + 3x -8x² + 16x - 4

collect like terms

= - 2 + 10x³ - 21x² + 19x - 4 ← in standard form

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step-by-step explanation: