Top answers

Solve the simultaneous equations 5x+2y=11 and x-y=-2.

Simultaneous Equations are equations involving 2 or more unknowns that are to have the same value in each equation. The aim is to eliminate all except one unknown which will then allow us to find the value o...
PH
Answered by Peter H. • Maths tutor
10613 Views

What is a test cross (Genetics)?

In genetics, sometimes it is not easy to tell if an organism is heterozygous (having two different alleles of a gene) for a certain trait or if it is a homozygous (having the same identical alleles of a gene...
AH
Answered by Alisa H. • Biology tutor
9466 Views

A curve has equation y = 6ln(x) + x^2 -8x + 3. Find the exact values of the stationary points.

When thinking about stationary points, it is important to remember that these points happen when the gradient of the curve is 0 (-> dy/dx = 0), or if you prefer, when the rate of change of a graph is 0. S...
CP
Answered by Christopher P. • Maths tutor
7057 Views

How can I make my writing more sophisticated?

Remember, the mark scheme is looking for ‘sophisticated expression’, but what does that actually mean? Put simply, ‘sophisticated expression’ is actually just when a student has enough confidence in their wr...
ED
22277 Views

Factorise z^3+1 into a linear and quadratic factor. Let y=(1+i√3)/2. Show that y is a cube root of -1. Show that y^2=y-1. Find the value of (1-y)^6.

To factorise z 3 +1 into a linear and quadratic factor, it is best to try the factor theorem first. We set the equation to zero: z 3 +1=0.We need to find a value of z such that the above is true. By inspecti...
HL
Answered by Henry L. • Maths tutor
24889 Views