Top answers

The quadratic equation 2x^2 + 8x + 1 = 0 has roots a and b. Write down the value of a + b, a*b and a^2 + b^2.

Using Vieta's formulas, which make the correspondence between the sums and products of the roots of a polynomial and its coefficients, we can deduce that a + b = (-8)/2 = -4, a b = 1/2 =0.5 and a^2 + b^2 = (...
AI
Answered by Andreea I. • Maths tutor
6631 Views

What is a geometric series?

A geometric series is a series with a constant ratio between successive terms.
MF
Answered by Ming Fung Y. • Maths tutor
4986 Views

What is an Inverse function?

An inverse function is a function that "reverses" another function. That is, if f is a function mapping x to y , then the inverse function of f maps y back to x . [1]
MF
Answered by Ming Fung Y. • Maths tutor
5510 Views

How does filtration through the kidney work?

There are 3 key stages in filtration through the Kidney: Firstly, blood is pushed through a tubular structure called the glomerulus - imagine a bowl of noodles. The pressure of the blood in the glomerulus ca...
AP
Answered by Alastair P. • Biology tutor
4242 Views

What is crude oil and how is petrol derived from it?

Crude oil is a mixture of hydrocarbons. The crude oil is evaporatedand its vapours condense at different temperatures in the fractionating column. As you go up the fractionating column, the hydrocarbons have...
TP
Answered by Tahir P. • Science tutor
4239 Views