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write x^2 + 10x - 6 in the form (x+a)^2 + b

(x + 5) 2 - 5 2 - 6(x + 5) 2 - 25 - 6(x + 5) 2 - 31
TB
Answered by Thomas B. • Maths tutor
7642 Views

solve; (6x - 2)/2 - (4x+7)/3 = 1-x

numerical answer x =-1/8 oe (or equivalent), but I am more interested in the method used My method simplify first fraction to 3x-1, multiply both sides by 3, collect like terms, divide through to get x on it...
RL
Answered by Ruth L. • Maths tutor
3760 Views

How is DNA replicated?

DNA replication is a multi stage process which is carried out in the nucleus of the cell. We know that DNA is in a double helix structure and for replication to occur it must be unwound into two single stran...
WG
Answered by William G. • Biology tutor
4342 Views

There are N counters in a bag, 4 being red and the rest being blue. I take two counters at random from the bag (without replacing the first).The chance i take two blue counters is 1/3, See below in the answer box

Show that n^2-13n+30=0We note that 4/N denotes the probability of a me picking a red counter and (N-4)/N denotes the chance of me picking a blue counter.Since I select two counters and do not replace the fir...
RP
Answered by Roshan P. • Maths tutor
8346 Views

Using the diagram and your knowledge of vectors, show that BCD is a straight line

BC = BA - CA = (3a - b) - (a + 4b) = 2a - 5b BD = BA + AB = (3a - b) + (a - 9b) = 4a - 10b BC = 1/2 BD. Using basic vector rules, we know that if vectors are multiples, then they are parallel. Since BC and B...
JA
Answered by Jonathan A. • Maths tutor
19146 Views