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How to differentiate 9x^2+ 4x-7=0

To differentiate we multiply the power by the number infant of the x, and then reduce the power by 1. So the answer would be 18x+4=0

Answered by Abigail R. • Maths tutor

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y = Sin(2x)Cos(x). Find dy/dx.

Assume base differentiation knowledge: Sin(x) = Cos(x), Cos(x) = -Sin(x)The question combines the chain and product rule. To begin, start by splitting the equation: Sin(2x)Cos(x) = Sin(2x) x Cos(x)The pro...

Answered by Saskya C. • Maths tutor

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Find the equation of the tangent to the curve y=3x^3+x^2+5 at the point (1,9)

y=11x-2

Answered by Ethan W. • Maths tutor

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y=x^3-3x^2+2x+5 a)Write down the coordinates of P the point where the curve crosses the x-axis. b)Determine the equation of the tangent to the curve at P. c)Find the coordinates of Q, the point where this tangent meets the curve again.

a) P (0,5)b) y = 2x + 5c) Q (3,11)

Answered by Harrison A. • Maths tutor

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Five Chocolate bars cost £11. Three Chocolate Bars and two packs of Biscuits cost £13.6. How much does two Chocolate bars and one pack of biscuits cost.

We know from the question that 5C = £11, where C is number of Chocolate Bars. Therefore C= 11/5 which is £2.20.We also know that 3C + 2B = £13.6 where B is number of packs of Biscuits.Since we know what C...

Answered by Samuel S. • Maths tutor

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