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Solve the following equations x^2-2x+4=0, x^2+4x+1=0

x 2 -2x+4= (x-2)(x-2)=0 x=-2 (double root) x 2 +5x+1=0 x 1,2 = -5+_ (5 2 -4(1)(1) ) 0.5 /2 x 1 =4.8 x 2 =-0.2 (to 1 d.p.)
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Answered by Kyriakos F. • Maths tutor
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How do I go about approaching the unseen poem in the exam?

Firstly, make sure you re-read and have understood the question! This will give you an idea of what ideas and themes to look out for. Read the poem several times and mentally address these questions as you g...
VC
Answered by Vicky C. • English tutor
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How can a child inherit a disease from their parents if neither parent has the disease?

We inherit two copies of a gene called alleles, one from each parent. The alleles we inherit from our parents can either be dominant or recessive. A dominant allele requires just one copy of the allele to be...
JT
Answered by Joanna T. • Biology tutor
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I am having trouble learning Mitosis, could you explain it for me please?

Mitosis is a form of asexual reproduction in plants. A parent cell splits into 2 identical daughter cells. There are 46 Chromosomes in each cell and each chromosome is copied exactly, using chromatids to pul...
AL
Answered by Alex L. • Biology tutor
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y = 4x / (x^2 + 5). Find dy/dx.

We use the quotient rule here which states that if y = f(x)/g(x) then dy/dx = (f'(x)g(x) - g'(x)f(x)) / (g(x)^2). Here f(x) = 4x and g(x) = x^2 + 5, so we have f'(x) = 4 , g'(x) = 2x. This gives us dy/dx = (...
PS
Answered by Patrick S. • Maths tutor
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