C2 Bionomial Expansion
"Use the binomial theorem to expand (3+10x)^4"
I managed to do this fine and got:
81+1080x+5400x^2+12000x^3+10,000x^4
Only thing, I'm struggling with is this next part, and questions similiar to this
"Hence by choosing a suitable value for x find the exact value of (1003)^4"
I managed to do this fine and got:
81+1080x+5400x^2+12000x^3+10,000x^4
Only thing, I'm struggling with is this next part, and questions similiar to this
"Hence by choosing a suitable value for x find the exact value of (1003)^4"
3 + 10x = 1003
What is x? How can you apply this to what you've done so far?
What is x? How can you apply this to what you've done so far?
Original post by loperdoper
3 + 10x = 1003
What is x? How can you apply this to what you've done so far?
What is x? How can you apply this to what you've done so far?
so x=100
Would you sub this into (3+10x)^4?
Original post by loperdoper
3 + 10x = 1003
What is x? How can you apply this to what you've done so far?
What is x? How can you apply this to what you've done so far?
so x=100
Would you sub this into (3+10x)^4?
Actually no you wouldn't do that, I have no idea what you'd do
Original post by Mohammed212
Are you sure its 1003 i think it may be 1.003
Most definitely 1003
Original post by Bevin
so x=100
Would you sub this into (3+10x)^4?
Actually no you wouldn't do that, I have no idea what you'd do
Would you sub this into (3+10x)^4?
Actually no you wouldn't do that, I have no idea what you'd do
You'd sub x=100 into the expanded version to gain an approximation for (1003)^4, if that's what the question requires?
Posted from TSR Mobile
oh did you manage to do the rest of the question
Original post by Bevin
so x=100
Would you sub this into (3+10x)^4?
Would you sub this into (3+10x)^4?
if you sub it into (3+10x)^4, you get (1003)^4, so you have a suitable value for x
Where else does x appear in your working?
(edited 9 years ago)
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