Friday

March 6, 2015

March 6, 2015

Posted by **Anonymous** on Saturday, November 17, 2012 at 7:23pm.

2^4x-1/2^3x+2=4

- Algebra 2.. -
**Steve**, Saturday, November 17, 2012 at 10:22pmlet z = 2^x, and you have

z^4 - 1/z^2 + 2 = 4

(z^6 - 1)/z^2 = 2

don't like that. How about

(z^4 - 1)/(z^3 + 2) = 4

z^4 - 1 = 4z^3 + 8

z^4 - 4z^3 - 9 = 0

still no joy. You sure there's no typo somewhere?

Ah. how about

2^(4x-1) / 2^(3x+2) = 4

since we're dividing, subtract exponents to get

2^(x-3) = 4

now, 4 = 2^2, so we have

2^(x-3) = 2^2

x-3 = 2

x = 5

See how important parentheses can be?

- Algebra 2.. -
**Anonymous**, Saturday, November 17, 2012 at 11:49pmThank you.

**Answer this Question**

**Related Questions**

Math - We have an important chemsitry test due and I want to make sure that I do...

Intermediate Algebra - Combine like terms: -3x^2+2x-4x^2-9+6x-2x^2+8 Solve for x...

algebra - Solve the indicated variable: 1. Volume of a cone: solve for h: V=Ļir^...

Algebra - Solve for x: h=(k/4)(x-3L) Solve for B: v-6Bxk=7B Solve for S: z+(1/7)...

Algebra - Hi, how would I solve these 2 equations using algebra? It states in ...

Algebra 2 - Solve each system 3x+2y= -2 9x- y= -6 I know how to solve for x but ...

Algebra 2 - How do I solve these inequalities: e^3x>e^x-1 -6log (subscript of...

algebra - solve for the indicated variable: a. temperature formula solve for F: ...

Algebra - FIND THE GCF OF THE PRODUCT (3B+6)(2B-10) SOLVE... X^2=-6X x(x+6)= 0 x...

algebra - im trying to solve a literal equation, then solve the specific ...