Top answers

Solve the following simultaneous equations for x and y. 2x+5y=9 and 4x-3y=7

Here the best method to use will be elimination since using a substitution for x or y may produce some nasty fractions. The first thing to look for is that the 2x and 4x are nice multiples of each other. As ...
JG
Answered by Jamie G. • Maths tutor
8621 Views

How do you expand Double Brackets?

For this we will use the FOIL Method. This stands for Front, Outside, Inside, Last. This helps us to check that we have multipled everything. For example, lets use (x+1)(2x+3): Multiply the first terms: x 2x...
HR
Answered by Harry R. • Maths tutor
4657 Views

Solve for x, between 0 and 360 degrees, 4cos2 (x) + 7sin (x) – 2 = 0

Solve for x, between 0 and 360 degrees, 4cos 2 (x) + 7sin (x) – 2 = 0 The way to approach this problem is to understand the relation that: sin 2 (x) + cos 2 (x) = 1 That equation can be rearranged to give: c...
LZ
Answered by Luke Z. • Maths tutor
12444 Views

(4x + 3)/(x + 1) + 2 = 8

(4x + 3)/(x + 1) + 2 = 8 Firstly minus the 2 from both sides (4x + 3)/(x + 1) = 6 Then multiply both sides by the denominator (x + 1) 4x + 3 = 6(x + 1) Expand the brackets. 4x + 3 = 6x + 6 Rearrange the equa...
JW
Answered by Jessica W. • Maths tutor
3553 Views

Circle C has equation x^2 + y^2 - 6x + 4y = 12, what is the radius and centre of the circle

The equation of a circle is (x-a)^2 + (y-b)^2 = r^2, where (a,b) is the centre of the circle, and r is the radius. To condense our equation into this form we have to use the technique of completing the squar...
HB
Answered by Haren B. • Maths tutor
11546 Views