CAIE IGCSE Mathematics Formula Rearrangement

Review CAIE IGCSE Mathematics formula rearrangement through repeated subject terms, algebraic denominators, powers, roots and bracket division.

Exam points

collect repeated subject terms and factorise before dividing by a bracket
isolate squared, cubed or rooted variables before applying inverse powers
clear algebraic denominators when the new subject appears in a fraction

[Maximum number: 3]

$y=px^2+t$

Rearrange the formula to write x in terms of p, t and y.

$x=\pm\sqrt{\frac{y-t}{p}}$
oe final answer

M1 for correct rearrangement to isolate $x^2$ term
M1 for correct division by p
M1 for correct square root; incorrect answer scores a maximum of M2
If 0 scored, SC1 for a correctly rearranged formula with p=3 and t=-13 substituted

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E2.5.7 Change the subject of formulas question 1