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brony2199
31.07.2020 •
Mathematics
Solve 3x2 + 5x − 8 = 0 by using an appropriate method. Show the steps of your work, and explain why you chose the method used.
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Ответ:
Step-by-step explanation:
Hello,
We need to solve the following equation:
It means that the sum of the zeros is
and the product is
.
We can easily see that 1 and
does the job.
So the solutions are 1 and
.
Another way to see it is to notice that 1 is a trivial solution as 3+5-8=0, so (x-1) is a factor and (we match the terms)
And we find again the same solutions.
Or we use the discriminant.
The discriminant method works in all cases, so you cannot be wrong using it.
The first method based on the sum and the product usually works well for integer solution which is not the case here.
Finding a trivial solution to be able to factorise could be used here as 1 is really a trivial solution.
Hope this helps.
Do not hesitate if you need further explanation.
Thank you
Ответ:
The answer is 95 in^2
Step-by-step explanation:
The lawn is made up of 5 congruent triangles.
Since we know the area of the triangles we can add or multiply them.
5 * 19 = 95 so the area is 95 in^2