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Part a, part b
Date Posted:
5 years ago
When can I use the U formula for logarithm?
You will notice that two terms are exactly the same. I let u = log 5 x, for example, to simplify matters because it is easier to see the expressions in that way. It’s not a must to let u be something though.
I send u a qns, can you use U formula for Me. Thanks
For example, if (5^x)^2 - 2 (5^x) + 1 = 0, letting u = 5^x (you can use other letters also) transforms the equation into u^2 - 2u + 1 = 0 which you immediately recognise to be a quadratic equation.
We then solve the quadratic equation followed by solving for x.
We then solve the quadratic equation followed by solving for x.
Done up - in that expression we only have x and y after conversion so there is no need to replace x or y by u.
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Part c, part d
Date Posted:
5 years ago