can someone explain the steps to me too? I am not sure

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secondary 3 | E Maths
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secondary 3 E Maths

can someone explain the steps to me too? I am not sure

Date Posted: 6 years ago

6 years ago

I mean A MATH

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First you expand the equation, then you take out x and numbers! Take a look at my working and see if you understand!!

Date Posted: 6 years ago

6 years ago

Thank you so much!!
Why cannot sub b=-20 into eqn