Saturday

August 2, 2014

August 2, 2014

Posted by **Jeconiah** on Tuesday, August 7, 2012 at 3:23am.

- Please help quick!! Mathematics A -
**Elena**, Tuesday, August 7, 2012 at 5:26am(3^2)^x-3^x-8=0,

(3^x)² -3^x -8 = 0,

3^x =y,

y² -y - 8=0,

y= (1±√33)/2.

Since 3^x>0, the negative root is nonsence,

=> y= (1+√33)/2 =3.37228,

3^x =3.37228,

x=log(3)3.37228= =ln3.37228/ln3≈1.21559/1.0986=1.1065

Test:

9^1.1065 – 3^1.1065 – 8 =

=11.372 – 3.372 – 8 = 0

**Related Questions**

Please help quick!! Mathematics A - Solve for x: 9^x-3^x-8=0

Mathematics-please help quick!! - If (x+y)^2=168 and xy =4, then x^2 + y^2=?

Mathematics-please help quick!! - Find the reminder when (x^4-9x^2-2x+5) is ...

Mathematics-please help quick!! - If 16x+8y represents the perimeter of a ...

Mathematics-please help quick!! - In a city, the PMV fare is 50 toea. The fare ...

Algebra......Help Quick!! - 12a^3bc-18a^2bc^2+6a^2c, x^2+20x+36, 12x^4-8x^3-4x^2...

Advanced Mathematics - Please help me solve this; Solve these inequalities and ...

Please help quick. Algebra - solve: 2x^2-3x+5 divided by 2x-1

please help quick! Calculus - solve 6x-2x^3 with first principal

Mathematics-please help! - Solve for x: 9/28 + 3/x+2 = 3/4.