Top answers

Maths
A Level

Derive the quadratic formula. From it, write down the determinant and explain, how is it related to the roots of a quadratic equation.

The general quadratic equation is ax^2+bx+c=0, now we need to Complete The Square, which allows us to have only one "x" term. First, divide the equation by "a", leaving us with x^2... ...

MK
Answered by Martin K. Maths tutor
5031 Views

How do I sketch a polynomial function?

Before you start it is best to gather as much information as you can about the function. The most important things to find are any roots - as these will tell where the graph should cross the axis - and th...

JL
Answered by Julu L. Maths tutor
4196 Views

Solve the equation |3x + 4| = |3x - 11|

Here we have an equation involving absolute values. As a general rule |a| = +a and |a| = -a. We can apply that to our RHS. In the first case we get that 3x + 4 = 3x - 11, however after we subtract 3x from...

VB
Answered by Viktoria B. Maths tutor
7646 Views

Find the solutions to z^2 = i

Here z is a complex number, and therefore, z = a + bi. Thus, our equation becomes (a + bi)^2 = i. Expanding the brackets we get a^2 + 2abi + (b^2)(i^2) = i. Since i is the squ...

VB
Answered by Viktoria B. Maths tutor
33775 Views

integrate 5x^2 + x + 2 and find the value of c if the curve lies on the coordinates (1,3)

when integrating you must add one to the power and divide by the new power. so y=(5x^(2 + 1))/3 + (x^(1+1))/2 + 2x + c now substitute 1 for x and 3 for y so 3= (5(1)^(2 + 1))/3 + ((1)^(1+1))/2 + 2(1) +...

MC
Answered by Meherun C. Maths tutor
3295 Views

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