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Why is completing the square useful and how do you do it?

Completing the square is nice and easy. If you have an equasion of the form x 2 +ax+b=0 then simply rewrite the equasion in the form (x+a/2) 2 -(a/2) 2 +b=0. This may sound complicated but is we use numbers ...
EB
Answered by Edward B. • Maths tutor
4082 Views

Expand and simplify 3(x+4) - 2(4x+1)

3(x+4) - 2(4x+1)= 3x + 12 - 8x + 2= 3x - 8x + 12 - 2= -5x + 10
PP
Answered by Pioli P. • Maths tutor
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Craig weighs 74.2 kg, Connie weighs 67.8 kg, and Chloe weighs 69.4 kg. What is the range of their weight?

6.4 kg
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Answered by Pioli P. • Maths tutor
4464 Views

What is the chain rule and how is it used?

The chain rule is used to find the derivative of an expression in the form h(f(x)) where you have a function in terms of a function of x for example: h(f(x)) = 2(3x+1)^3 where f(x) = 3x+1 In order to use the...
JB
Answered by Joseph B. • Maths tutor
3704 Views

How do you solve a quadratic equation e.g. x^2 - 5x - 14 = 0?

Quadratic equations take the form ax^2 + bx + c = 0. In the case above, a = 0, b = -5, c = -14. In order to solve it, we can factorise the equation into the form (x+c)(x+d) = 0. The answers are then x = -c, ...
MP
Answered by Manal P. • Maths tutor
4091 Views