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Make t the subject of this equation: x=4t-7

x=4t-7 take the -7 over first, swapping the sign as it passes over the equals sign x+7=4t 4t = 4*t so we need to divide the other side of the equation by 4 1/4(x+7)=t
LC
Answered by Louise C. • Maths tutor
3793 Views

Find the value of x in the equation x^2 - 2x + 1 = 0

Factorise: X^2 means 2 brackets (x )(x )=0 factors of 1 = 1 (x 1)(x 1)=0 to get minus 2 you must do (-1) + (-1) so (x-1)(x-1)=0 therefore x-1=0 and x=1
LC
Answered by Louise C. • Maths tutor
4273 Views

Solve the simultaneous equations: y-2x-4 = 0 (1) , 4x^2 +y^2 + 20x = 0 (2)

Re-arrange (1) : y = 2x + 4 Square both sides: y^2 = 4x^2 + 16 Substitute (1) into (2) and simplify: 2x^2 + 9x + 4 = 0 Factorise the equation: (2x+1)(x+4) = 0 Solve for x: x = -1/2 and x = -4 Substitute thes...
GA
Answered by Giorgos A. • Maths tutor
10199 Views

How do you find the next number in a given sequence?

First, you look for the difference between every number in the sequence, ie. what do you add to the first number to equal the second number? If you find that the difference is the same for every number, then...
EM
Answered by Eleanor M. • Maths tutor
12546 Views

How do we know that the derivative of x^2 is 2x?

To answer this we must remember that the derivative at a point on a curve, in this case x^2, is simply the value of the gradient of the line that just touches that point on the line. We can start by approxim...
JM
Answered by Jamie M. • Maths tutor
5081 Views