Find the x and y coordinates of the minimum of the following equation: y = x^2 - 14x + 55.

We can see that the quadratic function will be U-shaped, as the quadratic term is with a positive sign. Therefore, the absolute extreme of the function will be a minimum. Step 1: Differentiate to find the slope of the function. dy/dx = 2x - 14Step 2: Find where the slope equals 0. This will be the x coordinate. 2x -14 = 0 2x = 14 x = 7Step 3: Substitute x into the original equation, to get the functions value at x. y = 7^2 - (14 x 7) +55 y = 49 - 98 + 55 y = 104 - 98 y = 6Step 4: We have our coordinates: (7,6)

FD
Answered by Ferenc Dániel Z. Further Mathematics tutor

1898 Views

See similar Further Mathematics GCSE tutors

Related Further Mathematics GCSE answers

All answers ▸

f(x) = 2x^3+6x^2-18x+1. For which values of x is f(x) an increasing function?


Rationalise and simplify (root(3) - 7)/(root(3) + 1) . Give your answer in the form a + b*root(3) where a, b are integers.


Find the stationary points of y=x^3 + 3x^2 - 9x - 4


l1 and l2 are tangents of a circle. l1 intersects the circle at (3-√3,5) with a gradient of √3, and l2 intersects the circle at (3+√2,4+√2) with a gradient of -1. Find the centre of the circle, and hence find the radius of the circle.


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

MyTutor is part of the IXL family of brands:

© 2025 by IXL Learning