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-x2-4x+1 when y = 0

Factorise the expression in the equation by using the quadratic equation formula:

(-x-4.2360679775)(x-0.2360679775)

So: x = 4.2360679775 or x = 0.2360679775

Check that your answer is correct by multiplying out the brackets which will take you back to -x2-4x+1 = 0.

When working out this type of quadratic equation remember the rules governing the minus signs in multiplication and division.

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15y ago

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