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Rearrange this formula to make y the subject - OCR - GCSE Maths - Question 9 - 2018 - Paper 5

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Rearrange this formula to make y the subject. $x = y^2 + 7$

Worked Solution & Example Answer:Rearrange this formula to make y the subject - OCR - GCSE Maths - Question 9 - 2018 - Paper 5

Step 1

Step 1: Subtract 7 from both sides

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Answer

To isolate the term involving y, subtract 7 from both sides of the equation:

x−7=y2x - 7 = y^2

Step 2

Step 2: Take the square root of both sides

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Answer

Next, to solve for y, take the square root of both sides:

y=ext±x−7y = ext{±} \sqrt{x - 7}

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