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Further Mathematics

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GCSE or A-level Maths: How can I find the x and y intercepts of a cubic function?

Assume we have the function:
y = x ( x² + 8x - 9)
This function is known as a cubic function as when multiplying out the brackets, the highest function of x would be x³.Not...

Answered by Ahmed M. • Further Mathematics tutor

8252 Views

Solve these simultaneous equations: 3xy = 1, and y = 12x + 3

From first equation: 3xy = 1 => x = 1/(3y)Substitute expression for x into second equation: y = 12x + 3 => y = 12(1/3y) + 3 = 4/y +3Multiply through by y: y² = 4 + 3y => y²

Answered by Hallam M. • Further Mathematics tutor

1891 Views

Solve the following simultanious equations: zy=28 and 2z-3y=13

zy=28 so y=28/z13=2z-3y13= 2z - (28 x 3)/z13=2z-84/zmultiply each side by z to give 13z = 2z²-84rearange for a quadratic2z²-13z-84=0solve by factorising(2z+8)(z-21/2)z= -4 0r 21/2sub...

Answered by Oliver B. • Further Mathematics tutor

1770 Views

Prove that sin(x)^2 - 5cos(x)^2 = 6sin(x)^2 - 5

5 = 5(cos(x)^2 + sin(x)^2) = 5cos(x)^2 + 5sin(x)^2=> 5 - 5cos(x)^2 = 5sin(x)^2=> sin(x)^2 + 5 - 5cos(x)^2 = 6sin(x)^2=> sin(x)^2 - 5cos(x)^2 = 6sin(x)^2 - 5

Answered by Nicholas T. • Further Mathematics tutor

1717 Views

Find the coordinates of any stationary points of the curve y(x)=x^3-3x^2+3x+2

A stationary point is a point where the gradient of a curve is 0. The derivative of a curve gives us a function for the gradient at every point on the curve. So we have that dy(x)/dx=0 if and only if the ...

Answered by Robin S. • Further Mathematics tutor

2541 Views