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We start by noticing that both the numerator and denominator are expressions which can be factorised into brackets. Starting with the numerator, we multiply the coefficient of x^2 and the constant term to...

Write the 2 equations above each other: 3x-y=23 2x+3y=8First we want to remove the y terms to be able to find out x, so multiply the top equation by 3 9x-3y=69 2x+3y=8Now that we have -3y on the top and -...

1) Expand the brackets: (n-2)² = (n-2)(n-2) = n² - 2n - 2n +4 = n² - 4n + 42) Substitute this into the original expression: n²...