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Show that r^2(r + 1)^2 - r^2(r - 1)^2 ≡ 4r^3.

Start with the left hand side (LHS) of the equation. r^2(r + 1)^2 - r^2(r - 1)^2Take the equivalent terms from the separate parts of the LHS outside of set of brackets.r^2[(r + 1)^2 - (r - 1)^2]Expand the in...
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Answered by Andrew D. • Maths tutor
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What structure is required for a perfect 16 marker?

A perfect 16 marker would be structured like this: 1. A small introductory paragraph Perhaps including the definition of the key word put forward in the question and an introduction to your line of argument ...
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Can a projectile of speed 10m/s at an angle of 45° to the horizontal following a path perpendicular to a wall 8m away and 6m high reach beyond the wall? Justify your answer. Take g as 10m/s/s

First draw a rough diagram of what the question describes. The student must work backwards. To answer, they must know the height of the projectile at the wall. To know the height of the projectile, they need...
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Answered by Anton B. • Physics tutor
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Solve the simultaneous equations 8x+2y=34 and 4x+2y=18

1.Simplify the two equations: 4x+y=17and 2x+y=9. 2. Rearrange one of the equations to make y=: y=9-2x. 3.Substitute into other equation:4x+9-2x=17. 4. Simplify:2x=8 x=4. 5.Substitute back into either of the ...
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Answered by Lara M. • Maths tutor
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Describe how mRNA is produced in the nucleus of a cell

Helicase (an enzyme) breaks the hydrogen bonds between the DNA resulting in two strands. Only one strand acts as a template. RNA nucleotides attracted to exposed bases according to base pairing rules (A-U, G...
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Answered by Rachel N. • Biology tutor
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