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# binomial expansion watch

1. a) Expand (1 3x)^8 in ascending powers of x, up to and including the term in x^3.b) Showing your working clearly, use your expansion to find, to 5 significant figures, an approximation for 1.03^8. please can someone help me answer this??
2. (Original post by bobthebob123)
a) Expand (1 3x)^8 in ascending powers of x, up to and including the term in x^3.b) Showing your working clearly, use your expansion to find, to 5 significant figures, an approximation for 1.03^8. please can someone help me answer this??
is it (1*3x)^8 or (1+3x)^8 or (1-3x)^8?
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3. (Original post by bobthebob123)
a) Expand (1 3x)^8 in ascending powers of x, up to and including the term in x^3.b) Showing your working clearly, use your expansion to find, to 5 significant figures, an approximation for 1.03^8. please can someone help me answer this??
part b, once you have if expansion up to x^3 you will equate what's in the brackets to 1.03 and solve for x Then replace this value of x in Ur expansion and calculate it. you will get an approximate
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4. (Original post by brainmaster)
is it (1*3x)^8 or (1+3x)^8 or (1-3x)^8?
oh sorry it is (1+3x)^8
5. (Original post by bobthebob123)
oh sorry it is (1 3x)^8
use the formula;
1 nx ((n (n-1)/2!)(x)^2 ((n (n-1)(n-2)/3!)(x)^3.....
And part b)
equate the 1 3x to 1.03 and find value of x and use this value in your expansion to get the approximate.
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6. (Original post by brainmaster)
the expansion would be;
1+8 (3x)
let me know if this was helpful😊
Please edit your post - we don't give answers in the Maths forum we just give hints.
7. (Original post by Muttley79)
Please edit your post - we don't give answers in the Maths forum we just give hints.
I'm New here but thank I'll remember this....is the post okay now?
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8. (Original post by brainmaster)
I'm New here but thank I'll remember this....is the post okay now?
Thank you, yes

Do stay around and help - we find hints help more than doing a question for someone.

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