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How do you solve a quadratic equation? I always forget how to do that!

x 2 +4x+3=0 The first step is to factorise. To do this you need to find a pair of factors of 3 that add together to make 4. I recommend listing the factors of 3 to start with. Don't forget the negatives! 1 a...
HD
Answered by Hannah D. • Maths tutor
3556 Views

Solve: x^8-17x^4+16

You should treat the question as you would a normal quadratic and complete the square. First you should look at the factors of 16 and see which pair would result in the -17x; you can see that it would be -1 ...
JG
Answered by Jessica G. • Maths tutor
12805 Views

3(a+4)=ac+5f. Rearrange to make a the subject.

3(a+4)=ac+5f 3a+12=ac+5f 3a-ac=5f-12 a(3-c)=5f-12 a= (5f-12)/(3-c)
RR
Answered by Rumana R. • Maths tutor
4759 Views

1. The curve C has equation y = 3x^4 – 8x^3 – 3 (a) Find (i) d d y x (ii) d d 2 y x 2 (3) (b) Verify that C has a stationary point when x = 2 (2) (c) Determine the nature of this stationary point, giving a reason for your answer.

To differentiate use formula. multiply factor by power then minus one from power (where x is invloved) dy/dx = 12x^3 - 24x^2 d^2y/dx^2 = 36x^2 - 48x (this is just a further differentiation) b) to find statio...
EI
Answered by Elysa I. • Maths tutor
15757 Views

How do I find the equation of a straight line from a graph?

Let's use a general equation for straight lines, y= mx +c. Here, the m and c represent numbers (or constants), which will differ for each specific line. The number in the place of the m is the gradient of th...
KM
Answered by Katherine M. • Maths tutor
3996 Views