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(a) Express x +4x+7 in the form (x+ p) +q , where p and q are integers.

(x + 2) 2 +3
DS
Answered by Dylan S. • Maths tutor
4945 Views

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
6528 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
18049 Views

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
6310 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
3986 Views