The Student Room Group

need a question answered

anyone know the answer to this.

X^0.4= 2.3076
so whats x?

and the working out?
Reply 1
x25=ax^{\frac{2}{5}} = a


x=a52x = a^{\frac{5}{2}}
Reply 2
Original post by imMcLovin
anyone know the answer to this.

X^0.4= 2.3076
so whats x?

and the working out?


Have you studied logarithms?
Reply 3
Original post by raheem94
Have you studied logarithms?


no its just a general question i need answered for my cousin
Reply 4
Original post by TenOfThem
x25=ax^{\frac{2}{5}} = a


x=a52x = a^{\frac{5}{2}}


hi thanks for the reply is there any specific way to work that out or is that just a general rule
Reply 5
Original post by imMcLovin
no its just a general question i need answered for my cousin


No logs needed ... see my post 2
Reply 6
Original post by imMcLovin
hi thanks for the reply is there any specific way to work that out or is that just a general rule


power of a is the reciprocal of the power of x
Reply 7
Original post by imMcLovin
no its just a general question i need answered for my cousin


So do it as tenofthem said.

0.4=2/5,
x0.4=2.3076[br]x25=2.3076[br]x25×52=2.307652 x^{0.4} = 2.3076 [br]x^{\frac25} = 2.3076 [br] x^{\frac25 \times \frac52} = 2.3076^{\frac52}
Reply 8
Original post by raheem94
So do it as tenofthem said.

0.4=2/5,
x0.4=2.3076[br]x25=2.3076[br]x25×52=2.307652 x^{0.4} = 2.3076 [br]x^{\frac25} = 2.3076 [br] x^{\frac25 \times \frac52} = 2.3076^{\frac52}


ok thanks so thats the final answer right?!
Reply 9
well you need to do the sum
Reply 10
Original post by TenOfThem
well you need to do the sum


can you do the full sum for me plz. i havent studied maths in like five years this is for my cousin
Reply 11
Original post by imMcLovin
ok thanks so thats the final answer right?!


Sorry, i can't give you the answer here. But infact my previous post makes the answer very obvious.

x25×52=2.307652[br]x=2.307652[br] x^{\frac25 \times \frac52} = 2.3076^{\frac52} [br]x = 2.3076^{\frac52} [br]

Can you do it now?

Hint: use a calculator
Reply 12
ok got it. thanks

/end thread

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