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Solve x^2+2x-4, leaving your answer in the simplist surd form. (4marks)

Simplist surd form means use Quadratic equation

Write out Quadratic equation

Write out value of a, b and c

Fit these values into equation
Answered by Desnie R. • Maths tutor
2707 Views

Why is n^0 always 1 and not 0?

Anything raised to the zeroth power is a difficult thing to get your head around. The easiest explanation (not a full proof) is to look at what happens as we go down in powers of n: n^3=nnn ...

Answered by Joseph C. • Maths tutor

3426 Views

Sketch the curve y = x^2 - 6x + 5, identifying roots and minima/maxima.

Remeber the formula: (a - b)² = a² - 2ab + b². Notice that y = x² - 23x + 5, so we want to write this using (x - 3)

Answered by Tutor69809 D. • Maths tutor

4454 Views

Solve for x 2x +3 + (4x-1)/2 = 10

2x +3 + (4x-1)/2 = 10 The divisor (2) is the biggest problem right now so we need to get it on its own...

(4x-1)/2 = 10-2x-3 Equation has been rearranged!

...

Answered by Shannon H. • Maths tutor

4330 Views

Find the centre and radius of the circle with equation: x^2 + y^2 -4x +8y = 5, and determine whether the point (7,-4) lies on the circle.

First we complete the square on the equation of the circle to obtain: (x-2)^2 -4 + (y+4)^2 -16 = 5. Re arrange : (x-2)^2 + (y+4)^2 = 25 General equation of a circle: (x-a)^2 + (y-b)^2 = r^2, with centre ...

Answered by Alec S. • Maths tutor

5771 Views