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Expand and simplify the following expression: x(5x – 2) – 3(x2 – 2x + 7)

5x2 – 2x – 3x2 + 6x – 21= 2x2 + 4x − 21

Answered by Maths tutor
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The longest side in a right-angled triangle is 12cm. One of the shorter sides is 4 cm. Calculate the perimeter of the triangle

122 = 42 + x2 [This is pythagoras' theorem (a2 = b2 + c2) ]
144 =16 + x 2
128 = x2
11...

RC
Answered by Rachel C. Maths tutor
7706 Views

Which has a lower boiling point chlorine or bromine, and why?

Chlorine has a lower boiling point as it is smaller in size than bromine. Chlorine has fewer electrons than bromine and fewer electron shells so chlorine is smaller in atomic radius. Size affects the str...

GF
6455 Views

War is never right. Evaluate this statement.

Show arguments from both sides.Start off with own opinion and provide reasons as to why you feel that way. Then give a counterargument. Then give an opinion of a religious point of view e.g. Islam, Christ...

Answered by Religious Studies tutor
5728 Views

Make d the subject of the formula: 3d + dxy = 4

d (3 + xy) = 4
d = 4/(3 + xy)

Answered by Maths tutor
3599 Views

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