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cami06
12.04.2021 •
Mathematics
Please Hurry). Cora is using successive approximations to estimate a positive solution to f (x) = g (x), where f (x) = x^2 + 13 and g (x) =3x + 14. The table shows her results for different input values of x.
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Ответ:
f ( x ) = x^2 + 13
g ( x ) = 3x + 14
f ( x ) = g ( x )
x^2 + 13 = 3x + 14
Subtract sides minus 13
x^2 + 13 - 13 = 3x + 14 - 13
x^2 = 3x + 1
Subtract sides 3x
x^2 - 3x = 3x - 3x + 1
x^2 - 3x = 1
Subtract sides 1
x^2 - 3x - 1 = 1 - 1
x^2 - 3x - 1 = 0
Let's solve this equation for find the values of x .
* Reminder *
First of all we need to find the Delta using the following formula :
ax^2 + bx + c = 0
Delta = b^2 - 4ac
x = - b + delta^1/2 / 2a
..&..
x = - b + delta^1/2 / 2a
x^2 - 3x - 1 = 0
delta = (- 3)^2 - 4 × ( 1 ) × ( - 1 )
delta = 9 + 4
delta = 13
x = - ( - 3) + 13^1/2 / 2 × 1
x = 3 + 3.605 / 2
x = 6.605 / 2
x = 3.3025
x = 3.3 ( the nearest tenth )
..&..
x = - ( - 3) - 13^1/2 / 2 × 1
x = 3 - 3.605 / 2
x = - 0.605 / 2
x = - 0.3025
x = - 0.3 ( the nearest tenth )
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Thus we have two solutions for x which they are :
x = 3.3 ***&*** x = - 0.3
The question asked for the the positive solution so we can just accept x = 3.3
And we're done...
Ответ: