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2x become x^{2}

3x^{1/2} becomes 2x^{3/2}

1 becomes x

sub 9 into values for x = (81 - 54 +9) which equals 36

sub 4 into values for x = (16 - 16 + 4) which equals 4

now take away the value when you sub in 4 from when you sub in 9

= 36-4= 32

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One to one online tution can be a great way to brush up on your Maths knowledge.

Have a Free Meeting with one of our hand picked tutors from the UK’s top universities

Find a tutor