0
-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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The y intercept is 1
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What is the x-intercept of the graph of y equals x plus 1?
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x=1
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