Check my answers again Lol please Find the number of real number solutions for the equation. x^2-15=0 1 0 2 - my answer Can not be determined from the graph

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Check my answers again Lol please Find the number of real number solutions for the equation. x^2-15=0 1 0 2 - my answer Can not be determined from the graph

Mathematics
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are u sure its x^2-15=0 o.O ?
Use the quadratic formula to solve the equation. If necessary, round to the nearest hundredth. A rocket is launched from atop a 101-foot cliff with an initial velocity of 116 ft/s. a. Substitute the values into the vertical motion formula h = -16t^2 + vt + c. Let h = 0 b. Use the quadratic formula find out how long the rocket will take to hit the ground after it is launched. Round to the nearest tenth of a second. A) 0 = -16t^2+101t+116; 8s B) 0 = -16t^2+116t+101; 0.8s - my answer C) 0 = -16t^2+101t+116; 0.8s D) 0 = -16t^2+116t+101; 8s
  • phi
\[ x^2-15=0 \\ x^2= 15 \\ x= \pm \sqrt{15} \] you would not get real number solutions if you had to take the square root of -15 but here, you have two real numbers.

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wait a min let me recheck
cuz i find answer like @phi
  • phi
you have the correct equation, but if we used t=1 (which is close to t=0.8) we get -16+116+101 which is not close to zero (we want height = 0 when on the ground)
I don't get it, are my answers wrong..
can you help me @ASAAD123
and one more question Use any method to solve the equation. If necessary, round to the nearest hundredth. 7x^2-16x=8 0.42, –2.71- my answer 35.43, –33.14 5.42, –2.95 2.71, –0.42
the first one is correct. The equation is correct for the second one. The solution isn't. The third one is wrong
I wasn't sure.. for the second one I was like either B or C are both wrong.. if not B then C, not sure tho @peachpi
the equation you selected is the right one, but 0.8 isn't a solution to it. Check to see that you plugged the numbers into the quadratic equation correctly.
the third one is it D?
Can someone helpp meee
which question?
and one more question Use any method to solve the equation. If necessary, round to the nearest hundredth. 7x^2-16x=8 0.42, –2.71- my answer 35.43, –33.14 5.42, –2.95 2.71, –0.42 - my answer
D
not A
so we are trying to find solution to \[7x^{2}-16x=8\] ?
so which method did you use to solve this question?
you could use, graphical methods, quadratic formula, etc..
yes D

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