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The quadratic equation (k+1)x^2+12x+(k-4)=0 has real roots. (a) Show that k^2-3k-40<=0. (b) Hence find the possible values of k.

(a) There is a quadratic equation which should e solved using the delta andthe roots formulas. delta=a 2 -4ab delta=144-4(k+1)(k-4) delta=-4k 2 +12k+160 Because the problem tells us that the roots are real, ...
AB
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Háblame de las lenguas de España y cómo contribuyen a la identidad española

En España existen algunas lenguas diferentes, no solo el castellano. El catalán, de Cataluña y las islas baleares, es bien conocido por la gente fuera de España, también el euskera, idioma de los vascos. Ade...
CM
Answered by Charlie M. • Spanish tutor
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¿Que vas a hacer en las vacaciones de verano?

Voy a ir a España durante dos semanas con mi padre, mi madre y mi hermana. Mi padre se llama Chris, mi madre se llama Lucy, y mi hermana se llama Emily. Me gusta mucho ir a España en vacaciones porque hace m...
CM
Answered by Charlie M. • Spanish tutor
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How is an Ox-Bow Lake formed?

In the lower course of the river, meanders (bends in the river) form when water is moving faster on one side of the channel than the other. Erosion takes place on the outsides of the bends, as the greater en...
RC
Answered by Rachel C. • Geography tutor
19372 Views

A rocket travels with constant velocity in a straight line in deep space. A ball is thrown from the back to the front (ie from the thrusters to the nose). Describe the path of the ball. Describe the path if the rocket were accelerating along this line.

Consider first what happens when the rocket travels with constant velocity. Constant velocity implies that there are balanced forces (or indeed no forces) acting on the rocket. This is Newtons 1st Law. We kn...
SW
Answered by Sam W. • Physics tutor
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