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3 years ago

For what values of x is x2 + 2x = 24 true? –6 and –4 –4 and 6 4 and –6 6 and 4

Mathematics

2 answers:

mestny [16]3 years ago

8 0

Answer:

The answer is c

Step-by-step explanation:

Correct on e2020

kolezko [41]3 years ago

5 0

You can solve this 2 ways: plug in all of the options or solve for x.
i going to solve for x.

given: x^2+2x=24 (subtract 24 on both sides to get make it look like x^2+x+1)

x^2+2x-24=0 (now factor x^2+2x-24 out)

x^2+2x-24 --> (x-4)(x+6)

new equation: (x-4)(x+6)=0 (now make them both equl zero)

new equaions: x-4=0 x+6=0 (now solve for x for both)

x-4=0 x+6=0
x=4 x=-6
your answer is 4 and -6.
if you were not taught how to do what i just did then i can message you how to plug those numbers into x^2+2x=24 to find the answer.

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lisabon 2012 [21]

Answer:

The first listed equation is the correct equation to solve

The correct answer is: t = 5 seconds

Step-by-step explanation:

Let me mention first that there is an error in the statement that the gravitational pull of the Earth is 16 ft/s^2. It is in fact 32 ft/s^2, and the actual equation uses half of the acceleration multiplied by the square of the variable time, so it gives as final expression :

$y(t)=-16\,t^2+ 0 \,t +400$

and we want to find the value/s for "t" that make this equation equal zero (when it reaches the ground and the object just touches the ground. This makes the equation we want to solve:

$0=-16\,t^2+ 0 \,t +400\\16\,t^2+0\,t -400=0$

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3 years ago

Me ajudem nessa equação : 10x - 12 + 10= +18 - 20

nirvana33 [79]

10x - 12 + 10 = 18 - 20
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deff fn [24]

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Answer:

Step-by-step explanation:

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