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what is the determinant of a 2x2 matrix

the determinant is calculated using the formula ad - bc where a,b,c and d are the following positions in the matrix [a b c d]
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Answered by Abdullah T. • Maths tutor
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How do I solve sequences and how can I get the nth number?

e.g : 2,4,6,8.. the formula for the sequence can be found by using a+(n-1)d , where a is the first number in the sequence and d is the diffenece between the adjacent numbers in the sequence. so a =2 and d=2 ...
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Answered by Abdullah T. • Maths tutor
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How do we add and subtract negative numbers?

Well, for numbers, we have a number axis which is a straight line (like this [...]) and it is divided into more pieces, of one unit each. We begin to draw this axis by placing zero in the middle (like this [...
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Answered by Maria T. • Maths tutor
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There are n sweets in a bag, 6 of which are orange, the rest are yellow. Hannah takes a random sweet from the bag and eats it, and then does so again. The probability that Hannah eats two orange sweets is 1/3. Show that n^2-n-90=0.

The probability that the first sweet Hannah eats is orange is 6/n, as there are n sweets and 6 of them are orange. If this is indeed orange, then there are now n-1 sweets left in the bag, of which 5 are oran...
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Answered by Jonny S. • Maths tutor
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Factorise and solve x2 - 8x + 15 = 0.

Factorise and solve x 2 - 8x + 15 = 0. When factorising there are 3 things to look for; A common factor in each component of the equation. In this case there are no common factors. Whether the equation is ma...
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Answered by Olivia R. • Maths tutor
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