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princess42044
27.02.2021 •
Mathematics
F(x)= 18x^2+15x-10 find x when f(x) =15
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Ответ:
Step-by-step explanation:
f(x) is simply another way of saying y
We are told that y = 15, so we set the equation 18x² + 15x - 10 equal to 15.
Add 10
18x² + 15x = 25
18x² + 15x + 25 = 0
Factor
(6x − 5) (3x + 5) = 0
Find both solutions for x
6x - 5 = 0
6x = 5
x = 5/6
Now, for the other solution.
3x + 5 = 0
3x = -5
x = -5/3
Ответ:
510.
Step-by-step explanation: 35.7 / 0.07 is 510.