skyebrockbank
23.09.2019 •
Mathematics
Which are the solutions of x2 = -5x + 8?
- 5
-
7
-5 + 17
0 -5 -157 -5 + 157
0-5=17-57 v7
o s-x57.5+, 187
05-55+
in
sen
5 -
57
5 + 57
n
Solved
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Ответ:
1.27, -6.27 to the nearest hundredth,
or if you require it in exact form,
-2.5 + √14.25, -2.5 - √14.25.
Step-by-step explanation:
x^2 = -5x + 8
x^2 + 5x = 8
Competing the square:
(x + 2.5)^2 - 6.25 = 8
(x + 2.5) = 14.25
x + 2.5 = +/-√14.25
x = -2.5 + √14.25, -2.5 - √14.25
x = -2.5 + 3.77, -2.5 - 3.77
= 1.27, -6.27.
Ответ: