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How come x^2 = 25 has 2 solutions but x=root(25) only has one? Aren't they the same thing?

(This is something that I didnt fully understand for quite a while at school.) So when we are solving x 2 =25, in order to get x "on it's own" we square root both sides. However the definition of r...
DJ
Answered by Dylan J. • Maths tutor
9210 Views

Write an algebraic expression to show the area of a square with side length x+4

x 2 + 8x + 16
AB
Answered by Anna B. • Maths tutor
5875 Views

How would I find a the tangent of a point on a line?

You will end up with an equation with the form y = mx + c you should be familiar with from GCSE First you would need to differentiate the equation of the line For example if you had f(x) = x 3 + 2x and the c...
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Answered by Simon G. • Maths tutor
3610 Views

The quadratic function f(x) = p + qx – x^2 has a maximum value of 5 when x = 3. Find the value of p and the value of q.

Express the quadratic equation using the formula that uses the vertex (x and y of the minimum/ maximum value). The formula is f(x)=a(x-h)^2 + k, where h=-b/2a and k=f(h). Now we have that a=-1 from the probl...
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Answered by Rafik N. • Maths tutor
13245 Views

Solve algabraically: 6a+b=16 and 5a-2b=19

To answer this we want to split up the 'a' parts and 'b' parts of the question and answer them seperately because we can't answer the question with two letters. We can change one equation to b=16-6a and now ...
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Answered by Anna S. • Maths tutor
5750 Views