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What can I say about the roots of a quadratic equation without actually calculating them?

If a quadratic equation is of the form ax 2 +bx+c, calculate D (Discriminant) whose value is b 2 -4ac. If the value of D is negative, the equation has imaginary roots. If the value of D is positive, the equa...
SS
Answered by Swapnil S. • Maths tutor
5054 Views

Find the mean, median, mode and range of this data: 2, 5,6,12,5

To find the mean you must add all of the numbers together (2+5+6+12+5) and divide by how many numbers you have in your data set (5). Mean = 30 : 5 = 6 To find the median you must first order your numbers fro...
JT
Answered by Jonathan T. • Maths tutor
10951 Views

How do I factorise 3xy^2 – 6xy fully?

When we factorise, we do so to make the expression more simple. Factorising is when we take common factors from the expression and group them together, and then multiply these common factors by something to ...
MH
Answered by Matthew H. • Maths tutor
37264 Views

Factorise X^2 + 1X -12

Because the highest power of X is 2, this is a Quadratic Equation When factorised, these look like (x + a)(x + b) where a & b are constants To factorise this, we need to find 2 numbers which add together...
JW
Answered by Jack W. • Maths tutor
5781 Views

Show clearly that (3√3)^2 = 27

Show clearly that (3√3) 2 = 27 First of all, the question looks overfacing due to the surds, I can assure you that surds are not scary, they simply act as a means of clearing up messy numbers such as 1.73205...
EC
Answered by Eleanor C. • Maths tutor
15423 Views