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Find the minimum value of the function, f(x)= x^2 + 5x + 2, where x belongs to the set of Real numbers

We first differentiate f(x), and we get f'(x)=2x + 5. We then set this equal to 0 and then solve for x. We get that xmin= -2.5. We check whether this was indeed a minimum, by calculating the second derivativ...
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Answered by Pavlos P. • Maths tutor
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Find the gradient at the point (0, ln 2) on the curve with equation e^2y = 5 − e^−x . [4]

Figure out what skills are being tested: implicit differentiation and exponentials and logarithms.e 2y = 5 - e -x 2e 2y (dy/dx) = e -x (dy/dx) = e -x / 2e 2y At (0, ln2) (dy/dx) = e 0 / 2e 2ln2 e 2ln2 = 4 as...
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Answered by Theodore C. • Maths tutor
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There are 2 green jelly beans, 5 are yellow and 13 are red. Sue picks one jelly bean. What is the possibility that sue pick a jelly bean that is not yellow?

Answer: 3/4 2 green and 13 red therefore 15 of the 20 is not yellow simplifying this probability gives you 3/4.
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Answered by Ann P. • Maths tutor
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Expand and and simplify (x^2 + 7) (x - 1)

Firstly, it is important to understand here that "expand" means multiply the two brackets. A logical approach can be taken to this question. Deal with the first term (x^2) of the first bracket: mul...
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Answered by Sherin T. • Maths tutor
4283 Views

Find dy/dx when x+2y+3y^2= 2x^2+1

To solve this question we can use implicit differentiation. We can write:d/dx(x+2y+3y^2)=d/dx(2x^2+1).When differentiating something in terms of y with respect to x we can use the chain rule, this allows us ...
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Answered by Adam G. • Maths tutor
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