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For sketching the graph of the modulus of f(x) (in graph transformations), why do we reflect in the x-axis anything that is below it?

Let's remember what applying a modulus to any number actually does. Applying the modulus to a number just gives us back the positive version of that number- if it is positive, we get back itself, and if it i...
SR
Answered by Stefanos R. • Maths tutor
6151 Views

Why is DNA replication called semi-conservative replication?

Semi-conservative replication refers to replication of DNA in which the newly produced DNA molecules will contain 1 strand from the original DNA and a another strand that had been newly synthesised. In order...
AA
Answered by Awais A. • Biology tutor
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Solve the two simulatneous equations x^2+y^2=18 and x-y=3

1) X2 +2Y2= 18 2) X - Y = 3 Rearrange 2) in the form X=3-Y then substitute in to 1); (3-y)2 +2Y2=18, this is your new equation 3 9+3Y+3Y+Y2+2Y2=18 3) 9+6y+3Y2= 18 Divide equation 3) by 3 3 +2Y+Y2=6 Solve for...
RC
Answered by Rebecca C. • Maths tutor
6122 Views

Using methods of substitution solve the following simultaneous equations: y - 2x - 1 = 0 and 4x^2 + y^2 - 25 = 0

(1) 4x 2 + y 2 - 25 = 0 (2) y - 2x - 1 = 0 Rearranging (2) into an equation of y in terms of x we have:y = 2x +1 now substituting into equation (1) 4x 2 + (2x +1) 2 - 25 = 0 and now expanding this equation w...
KM
Answered by Kerry M. • Maths tutor
3825 Views

Solve the equation 2y^(1/2) -7y^(1/4) +3 = 0

2y 1/2 -7y 1/4 + 3 = 0 We need to use a substitution to obtain a quadratic.Let y 1/4 = x (use the y with the smallest fractional power as your substitution)From this, we can see that y 1/2 = x 2 (using the l...
SL
Answered by Sarah L. • Maths tutor
6857 Views