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If x^2 = 16, why isn't the answer just x = 4?

You're right that x = 4 is a solution to the equation - but the problem is it's not the only solution, x = -4 also works.You have to be careful not to take a shortcut by simply taking the square root of both...
LD
Answered by Laurie D. • Maths tutor
18938 Views

Give 3 differences between aerobic and anaerobic respiration.

Oxygen is used in aerobic respiration. More energy is generated in aerobic respiration. Carbon dioxide and water are products of aerobic respiration, whereas lactic acid is the end product of anaerobic respi...
HA
Answered by Hannah A. • Biology tutor
30789 Views

When do you need to make a past participle agree with a noun?

Firstly, when the past participle is used as qualifying adjective, you must make it agree it with the noun. For instance, in “les choses faites”, you turn the past participle “fait” into the feminine plural....
SM
Answered by Stanislas M. • French tutor
2775 Views

Outline two ways that planning and education can reduce the impacts of earthquakes (4)

One way to reduce impacts of earthquakes is to regulate building infrastructure planning to ensure that all buildings are installed with rollers that move with the seismic activity underground. Secondly, edu...
EM
8833 Views

solve 2x^2+4x-7=0

Notice that this is a quadratic. First you should try factorisation, then if unsuccessful try completing the square (or the quadratic formula). In this example, factorisation is not possible (I can this furt...
KW
Answered by Katie W. • Maths tutor
8930 Views