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x2+6x-2 = 0
We use completing the square when the equation cannot be factorised. Begin by placing x2 in the brackets and halving the number in front of the x...
y is proportion to 1/x2. This can be written as y=k/x2 where k is a constant of proportionality. Given that y=10 when x=5, k can...
As B is a stationary point, the value of dy/dx at this point must be equal to 0. Differentiating y gives this to be dy/dx = 6x2-2ax+8. At point B, <...
If asked to multiply out a set of brackets, one must remember to multiply each term in a set of brackets by every term in the other set of brackets. For example, (x+2)(x-4) = x2+2x-4x-8 = xARAnswered by Alden R. • Maths tutor4291 Views
in an inverse function, simply put the x and y are inversed: meaning x becomes y, and y becomes x
f(x): y=3x-5
f-1(x): x=3y-5 <=> x+5=3y <=> (x+5)/3 = y <=> OTAnswered by Olivia T. • Maths tutor4840 Views
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