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Expand (x+1)(x-4)

Using the "FOIL" Technique should help with the expansion, telling you what order to multiply things together. F stands for "firsts", so the first step is to multiply the first things in ...
EG
Answered by Emily G. • Maths tutor
5732 Views

How to differentiate y = xcos(x)

You would first of all establish which differentiation rule is required, for this question it would be useful to use the product rule splitting xcos(x) into x multiplied by cos(x). We can label u = x and v =...
SC
Answered by Sophie C. • Maths tutor
7362 Views

There are 10 boys and 20 girls in a class. The class has a test. The mean mark for all the class is 60. The mean mark for the girls is 54. Work out the mean mark for the boys.

Question: There are 10 boys and 20 girls in a class. The class has a test. The mean mark for all the class is 60. The mean mark for the girls is 54. Work out the mean mark for the boys.Answer: total mark for...
SK
Answered by Sajid K. • Maths tutor
4588 Views

Solve the simultaneous equations.

x= 9/2y= -3/2
SP
Answered by Shivam P. • Maths tutor
3241 Views

expand out the bracket (2m - 3)(m + 1).

claw technique: multiply each 'thing' in the first bracket with each 'thing' in the second bracket.2m 2 + 2m - 3m -3then collect the like terms2m 2 -1 -3
AP
Answered by Abigail P. • Maths tutor
4185 Views