Algebra 5
2 marks · NormalRearrange the formula to make the subject:
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x=-2\pm\sqrt{2y+4}
Also accept: x=-2\pm\sqrt{2y+4}
Common mistakes: x=\sqrt{2y+4}
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Marking points
M1 · 1 mark · Correctly rearrange by bringing all terms involving x to one side and complete the square or use quadratic formula to make x the subject.
A1 · 1 mark · Correct expression: or equivalent form.
Worked solution
2y = x^2 + 4x
x^2 + 4x - 2y = 0
Use the quadratic formula:
=