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Express x^2+2x+4 in the form (x+a)^2 + b, hence find the stationary point of the curve.

Step 1) x 2 +2x+4 = (x+1) 2 +3Step 2) Minimum point occurs at (-1, 3) I can use the whiteboard to explain it better.
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Answered by Anton N. • Maths tutor
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Work out the equation of the tangent to a circle of centre [0,0] at the point [4,3]

We know that: (1) the radius of the circle to the point [4,3] is perpendicular to the tangent line, (2) if two lines are perpendicular, their gradients are negative reciprocals of each other, and (3) the for...
JS
Answered by Jamie S. • Maths tutor
8462 Views

When should I use SER or ESTAR?

SER and ESTAR both mean 'To be' in English, but choosing the right one can be tricky. The most useful way to remember the difference is to decide whether what you are describing has a permanent/inbuilt quali...
GC
Answered by George C. • Spanish tutor
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What is 'Euthanasia'?

Euthanasia literally means “A good death” that comes from the Greek “eu” meaning good, and “thantos”meaning death. It must be noted that there is a key d ifference between euthanasia and suicide, e uthanasia...
LW
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What and where are alkali metals in periodic table? Explain reactivity trends.

Alkali metal have 1 outer electrons. Reactivity increases down the coloumn.
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Answered by Sandeep T. • Chemistry tutor
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