# Math

posted by .

Solve the equation using exact values. Check for any extraneous roots. 9^2x+4(9^x)=21.

• Math -

(9^x)^2 + 4(9^x) - 21 = 0
(9^x + 7)(9^x - 3) = 0
...

## Similar Questions

Solve 3^2x + 3^x - 21 check extraneous roots
2. ### Gr10 math

Solve using the quadratic formula. Express answers as exact roots and as approximate roots, to the nearest hundredth. b) k^2 - 9k = 1 c) 8w^2 = 2 - 3w Solve to the nearest hundredth. b) 1.2x^2 + 0.5x - 0.3 = 0
3. ### math12

solve. check for extraneous roots.3^2x-4(3)^x+3=0
4. ### Math

Solve the equation. Check for extraneous roots. 4^2x-4^x-20=0
5. ### 12 U Math

Solve and check for extraneous roots. log_2x+log_2(x+2)=3 * _2 is a subscript and (x+2) isn't a superscript*
6. ### Math

1) Solve the equation for p. Identify any extraneous solutions. √p=-1 A) -1 is a solution of the original equation. 1 is an extraneous solution. B) 1 is a solution of the original equation. C) 1 is a solution of the original …
7. ### Math

Solve 3 - x = √x2 - 5 . State any extraneous roots that you found. Identify the values of x for which the radical is defined.
8. ### Calculus

1. Use the Mean Value Theorem to find an x-value where the instantaneous slope=average slope over the given interval: f(x)=(9-x^2)^(1/2) on [-3,2] I have done three chapters of Calculus already and I never have had to check for extraneous …
9. ### algebra

Using the equation below as a model, fill in numbers in the place of a and b to create a rational equation that has an extraneous solution. x+a/ax=b/x Part 1. Show all work to solve for x in the equation and check the solution. Part …
10. ### Math

Could someone please help me to solve this equation using exact values. 9^(2x)+4(9^x)=21 and also check for extraneous roots. thank you

More Similar Questions