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Show that x^2 - 8x +17 <0 for all real values of x

consider the discriminant b 2 -4ac 8 2 -4x1x17 64-68=-4 discriminant is below 0, there are no real roots therefore x 2 - 8x +17 &lt;0
Answered by • Maths tutor
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In a circuit with a thermistor and bulb, what happens to the brightness of the bulb as the temperature increases?

As the temperature increases, the resistance of the thermistor decreases. So the resistance of the whole circuit decreases. Using V=IR, the PD remains constant but resistance has decreased, so current must i...
Answered by • Physics tutor
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From which cell type found in the gastrointestinal tract is cholecystokinin (CCK) secreted?

There are a wide range of enteroendocrine cell types (see below) but it is specifically the 'I-cells' of the duodenum that secrete CCK. CCK is responsible for modulation of bile secretion, exocrine pancreas ...
CG
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Explain why DNA replication is semi-conservative

When DNA is replicated, the original DNA double helix is separated into two strands. Each strand is used as a template for complimentary free nucleotides to bind to and create new complimentary DNA strand. T...
Answered by • Biology tutor
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How can I improve my listening skills?

The best way to improve your listening skills in a language is to listen! Start with easier activities and then work your way to the harder ones. Step 1 - Start off by listening to tracks appropriate to your...
MC
Answered by Megan C. • French tutor
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