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How do we expand (3y-2)^2?

(3y-2)^2=(3y-2)(3y-2)You're basically multiplying 3y-2 by itself.Let's start with the 3x in the first bracket.3y x 3y + 3y x (-2)=9y^2-6yNow let's move on to the -2 in the first bracket.-2 x 3y + (-2) x (-2)...
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Answered by Sum-Ping L. • Maths tutor
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Solve the simultaneous equations x+y=8 and 3x-y=4.

Notice that y has the same coefficient (ignoring the sign) in both equations. So, we will use the elimination method. The elimination method means that we will combine the two equations to eliminate the y va...
FS
Answered by Fiona S. • Maths tutor
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Make x the subject of the formula: y=(x+5w/2)^0.5

First recognise that (x+5w/2)^0.5 is the same as the square root of (x+5w/2). Then square both sides of the equation to get: y^2=(x+5w/2).Multiply both sides by 2 to eliminate the fraction from the RHS: 2y^2...
CW
Answered by Charles W. • Maths tutor
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3x + 2y =4 and 4x - 17 = 5y. Solve the simultaneous equations.

write out each equation one underneath the other so that the x’s are in one column and the y’s are in another.2) we also need to make sure that the numbers are also aligned up3) for 4x - 17 = 5y, we can add ...
Answered by • Maths tutor
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How do you know when to use sin, cos and tan in trigonometry?

Best way to remember it is: soh, cah and toa.Where soh means that the s ine of the angle is equal to the length of the o pposite side divided by the length of the h ypotenuse. Cah means that the c osine of t...
Answered by • Maths tutor
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