Mathematics, 23.01.2020 13:31 reagriffis24

Which of the following equations has only one solution? x2 + 4x + 4 = 0 x2 + x = 0 x2 - 1 = 0

Answers: 3

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Answer from: ella3714

you can solve all quadratic equations using this method:
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x^2 + 4x + 4 = 0
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the above quadratic equation is in standard form, with a=1, b=4, and c=4
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to solve the quadratic equation, by using the quadratic formula, copy and paste this:
1 4 4
into this solver: https://sooeet.com/math/quadratic-equation-solver.php
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this quadratic has ONE real root (the x-intercept), which is:
x = -2
x = -2
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---
---
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x^2 + x = 0
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the above quadratic equation is in standard form, with a=1, b=1, and c=0

Answer from: Madisonaubrey22

The correct equation is (A)~x^2+4x+4=0.

Step-by-step explanation: We are given to select the quadratic equation that has only one solution.

We know that - for the quadratic equation $ax^2+bx+c=0,a\neq 0$ the type of solution can be determined by the discriminant D=b^2-4ac as follows :

(i) If D > 0, then the equation will have two distinct real solutions.

(ii) If D < 0, then the equation will have two distinct complex solutions.

(ii) If D = 0, then there is only one real solution.

(A) The first equation is x^2+4x+4=0.

Here, a = 1, b = 4 and c = 4.

So, the discriminant is given by

$D=b^2-4ac=4^2-4\times 1\times 4=16-16=0.$

Therefore, the equation will have only one real solution.

(B) The second equation is x^2+x=0.

Here, a = 1, b = 1 and c = 0.

So, the discriminant is given by

$D=b^2-4ac=1^2-4\times 1\times 0=1-0=10.$

Therefore, the equation will have two distinct real solutions.

Here, a = 1, b = -1 and c = 0.

So, the discriminant is given by

$D=b^2-4ac=(-1)^2-4\times 1\times 0=1-0=10.$

Therefore, the equation will have two distinct real solutions.

Thus, (A)~x^2+4x+4=0 is the correct equation.

Answer from: Quest

answer: .64

step-by-step explanation

set up the formula for standard deviation for this set of numbers, then simplify

Me it is my last question and i don’t want to get it wrong standard deviation

Answer from: Quest

option: d is the correct answer.

d) none of the above.

step-by-step explanation:

clearly from the figure attached to the question we could see that there is no shape given. hence without any shape given in the figure and after rotation we can't obtained a square pyramid.

since, to obtain a image we need a proper figure of the pre-image so that it can be transformed.

hence, the correct answer is:

d) none of the above.

step-by-step explanation:

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