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How do I solve a quadratic equation by competing the square?

How would you solve x 2 +8x+16=81 Show that this can be factorised (x+4) 2 =9 2 Which can then be easily solved by square rooting both sides What if we could now use this method to solve all quadratics?!!? C...
Answered by • Maths tutor
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What is the function of mitochondria?

Mitochondria is an organelle responsible for providing energy. Mitochondria releases energy through the chemical process of aerobic cellular respiration, where one molecule of glucose can be broken down (oxi...
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Answered by Natalia F. • Biology tutor
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Describe the differences in properties between diamond and graphite.

Diamond – The electrons are tightly bound between the atoms. Bonds are difficult to break as they are held firmly together hence diamond has a hard structure. Diamond does not have free electrons to carry th...
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Answered by Jasmine G. • Chemistry tutor
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The National Living Wage (NLW) government policy target is to increase the NLW to £9 per hour by 2020. Explain two possible impacts of this policy on the UK supermarket industry.

Increased labour costs, many staff on minimum wage. This could impact on competitiveness against other supermarkets, as prices may have to be increased to match the increase in costs, so customers may switch...
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Answered by Alex B. • Economics tutor
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Solve ((x+2)/3x) + ((x-2)/2x) = 3

Multiple first fraction through by 2 and second fraction through by 3((2x+4)/6x) + ((3x-6)/6x) = (5x-2)/(6x) = 3Expand brackets and isolate x5x-2 = 18x13x = -2x = -2/13
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Answered by Alex B. • Maths tutor
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