Search our library of GCSE questions

Top answers

All subjects

GCSE

Solve the equation: x^2+7x=-12

The first step for this question is to rearrange the equation to get the right hand side equal to 0.x^2+7x+12=0Next, we have to try and factorise this equation. We do this by considering what two numbers ...

Answered by George A. • Maths tutor

3843 Views

Briefly describe Domino theory and how it affected US foreign policy.

Domino theory was an idea in the US, popularised during Eisenhower's time in office, that stated that if a country fell to communist forces, then other countries around it would also fall in succession, a...

Answered by Huw M. • History tutor

2184 Views

Assuming no friction, describe the motion of a simple pendulum released from rest at t=0 at amplitude A? Provide information about its speed and position at characteristic times during one period. [The 1D equation of motion is described by a cosine]

The displacement of the bob of mass m is given by the equation x(t)=A cos(w*t), with no phase offset as given by the boundary conditions (zero speed at t=0). By differentiating this equation twice the fir...

Answered by Stefan A. • Physics tutor

1593 Views

Explain the difference in reactivity of the halogens as group 7 is descended.

The halogens become less reactive as the group is descended. The halogens react by accepting an electron into its outer shell from another atom. As the halogens are descended, the outer electron shell bec...

Answered by Tomos A. • Chemistry tutor

1878 Views

Describe the process used by a binary search algorithm, and explain why binary search would not be appropriate for the list [3,2,5,7,9]

A binary search starts at the middle of the list and compares this item with the search term, if the item matches the search term, then the search is complete.If the item is not the search term, it is com...

Answered by William H. • Computing tutor

1369 Views