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A rectangle has a total perimeter of 32cm with sides of length '3x' and 'x+8'. Solve for x.

3x + x+ 8 + 3x + x + 8 = 328x + 16 = 328x = 16x = 2

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When solving two simultaneous equations, when should you use the method of elimination and when would you use the method of substitution?

I would first always label the two equations as equation 1 equation 2. I would then look to see if you can cancel one of the variables out by adding or subtracting the two equations together. If this is p...

Answered by Reece C. • Maths tutor

3147 Views

Use completing the square to find the minimum of y = x^2 - 4x + 8

Remember completing the square gives a result of the form (x+q)² + p where q and p are numbers
Also q is always half of the x term, which in this case is -4, as such q = -2
Substituti...

Answered by Sol D. • Maths tutor

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2 5/3 + 2 8/9

2 5/3 = 11/32 8/9 = 24/9 = 8/311/3 + 8/3 = 19/3 = 6 1/3

Answered by Huw R. • Maths tutor

2620 Views

Solve the equation 3x^2+2x-3=3.

rearrange the formula so that it is equal to zero by subtracting 3 from both sides of the equation.3x²+2x-6=02) To check if this formula can be factorised you can check if the value of b<...

Answered by Jolie B. • Maths tutor

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