emilyroll0
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7[sup:1uz1mte9]2x[/sup:1uz1mte9] - 4(7[sup:1uz1mte9]x[/sup:1uz1mte9]) = -3
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Pre-Calculus
- Thread starter emilyroll0
- Start date
What is the question?emilyroll0 said:7[sup:3jaq7jvx]2x[/sup:3jaq7jvx] - 4(7[sup:3jaq7jvx]x[/sup:3jaq7jvx]) = -3
What does 7^x times 7^x equal?
If you don't know that, you need classroom help.
emilyroll0 said:7[sup:2xmh6hhv]2x[/sup:2xmh6hhv] - 4(7[sup:2xmh6hhv]x[/sup:2xmh6hhv]) = -3
You might try this.
Let 7[sup:2xmh6hhv]x[/sup:2xmh6hhv] = a and substitute the a back into the equation getting...
a[sup:2xmh6hhv]2[/sup:2xmh6hhv] - 4a = -3
Solve that for a. You should get two solutions. Substitute back into 7[sup:2xmh6hhv]x[/sup:2xmh6hhv] = a. Now you will have to use logarithms to solve for x. Be sure to check your answer. I hope it's okay for you to use a calculator.