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How do I know which calculation to do first in questions with multiple operations (e.g. 2 x 3 - 2 x 5)?

In these situations, we can use an acronym called "BIDMAS". BIDMAS stands for: "brackets", "indices", "division", "multiplication", "addition" and ...
DM
Answered by Dalitso M. • Maths tutor
8019 Views

Solve this equation x^2 +4x - 5

Have you seen anything like this before? What do you understand by this equation? How do you expand brackets? Grid/smiles and eyebrows How confident are you with factors and times tables? How is a square num...
ZM
Answered by Zeenat M. • Maths tutor
3976 Views

Integrate x^2/(1+x^2)dx

Unlike if we had just x in the numerature, here the chain rule will do us no good. Integration by parts in this case also is little help - we end up with expressions at least as difficult as we started with....
LH
Answered by Laird H. • Maths tutor
8470 Views

Solve the simultaneous equations: 6a + b = 16 and 5a - 2b = 19

Rearrange the first equation to give b as the subject. b = 16 - 6a Then substitute that equation for b into the second equation. 5a - 2(16 - 6a) = 19 Simplify this equation (remembering to take account of th...
FL
Answered by Francesca L. • Maths tutor
5082 Views

Complete this substitution question: x^​3 - 25 = 103 - x^​3

Firstly, let's move the x^​3's onto the same side (and preferably keep them positive). Let's add x^​3 to both sides, which means the RHS will now read '2x^​3 - 25' and the LHS will read '103'. Next we want t...
AJ
Answered by Aoife J. • Maths tutor
3416 Views