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telo118 [61]
3 years ago
7

Solve each equation, if possible. Write irrational numbers in simplest radical form. Describe the strategy you used to get your

solution and tell why you chose that strategy.
〖3x〗^2+27=0
x^2-8x+1=0
Mathematics
1 answer:
VladimirAG [237]3 years ago
8 0
Problem 1
Do you know what a complex number is? If you do not, you can get an answer but not one you will like much.

(3x)^2 + 27 = 0               remove the brackets. Remember to square what's inside the brackets.

9x^2 + 27 = 0                Divide both terms by 9
9x^2/9 + 27/9 = 0

x^2 + 3 =  0                  Subtract 3 from both sides.
x^2 = -3                        Take the square root from both sides.
x = sqrt(-3)                    but the square root of - 3 = 3i
x = i*sqrt(3)

Problem 2
x^ - 8x + 1 = 0
a = 1
b = - 8
c = 1

x = [- -8 +/- sqrt(b^2 - 4*a*c) ]/(2*a)     Quadratic formula
x = [ 8 +/- sqrt( (-8)^2 - 4(1*1)]/2          Substitute Givens and combine
x = [ 8 +/- sqrt( 64 - 4 )] /2                    Subtract 4
x = [ 8 +/- sqrt (60)]/2                            Break 60 into 4 * 15 
x = [ 8 +/- sqrt (4*15)]/2                         Notice 4 is a perfect square. sqrt4 = 2
x = [ 8 +/- 2*sqrt(15)] / 2                        Divide through by 2
x = 8/2 +/- sqrt (15)
x = 4 +/- sqrt(15) the twos were gone
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First we need the whole garden:

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The two containers hold 328 ounces at the they hold same amount of water.

<u>Step-by-step explanation:</u>

The equations below model the ounces of  water, y, in each container after x minutes.

y = 16x + 104

y = -2x^{2} +40x+160

At the time after the start when the containers hold  the same amount of water, the two equations must be equal.

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The first step is to divide everything by 2 to make it simplified.

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Now put everything on the left .

x^2 + 8 x - 20 x + 52 - 80 = 0

Add the like terms together to further reduce the equation

x^2 - 12 x - 28 = 0

Factorizing the equation to find the roots of the equation.

Here, b = -12 and c = -28

where,

  • b is the sum of the roots ⇒ -14 + 2 = -12
  • c is the product of the roots ⇒ -14 × 2 = -28
  • Therefore, (x-14) (x+2) = 0
  • The solution is x = -2 or x = 14

Take x = 14  and substitute in any of the given two equations,

⇒ y = 16(14) + 104

⇒ y =224+104

⇒ 328 ounces

∴ The two containers hold 328 ounces at the they hold same amount of water.

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