Find the solutions to the equation by completing the square x^2-6x=7
1 answer:
The answers are x=7 and x=-1
Look at my photo for the work. I’m not sure if that’s exactly “completing the square”, (sorry I did my best) but the method I did in this works better for me.
What I find helps is when you multiply the coefficient of the first term (in this case 1 in the 1x^2) by the last term (-7). Then, find factors of -7 that add to the middle term (-6). The factors I found were 1 and -7. Then substitute them into the equation so it’s x^2 + 1x-7x -7=0. The value of the equation stays the same, except now you are able to group.
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Let X the random variable of interest "Number of correct anwers on the tet", on this case we now that:
And the expected value is given by:
Step-by-step explanation:
Previous concepts
A Bernoulli trial is "a random experiment with exactly two possible outcomes, "success" and "failure", in which the probability of success is the same every time the experiment is conducted". And this experiment is a particular case of the binomial experiment.
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Solution to the problem
Let X the random variable of interest "Number of correct anwers on the tet", on this case we now that:
And the expected value is given by: