Solve 3(x-2)=21

Firstly, I would explain to the student what exactly the question is asking you to do. When solving an equation we are finding the value of x. I would get the student to read the equation aloud, starting from the x. So the first process done to x is (x-2) and then this entire value is then multiplied by 3. (If the student is not aware that the process inside the brackets is read first, i would make that clear). Since 'multiplied by 3' is the last process spoken, we do the opposite of 'multiply by 3' to the other side of the equals sign: divide by 3, leaving x-2=7. I would then repeat this with the student, the last process done to the x is 'x subtract 2' therefore the opposite should be done to the other side: +2. Leaving the answer x=9.

Answered by Imogen N. Maths tutor

12523 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

Factorise the equation x^2 +5x = 6


A ball, dropped vertically, falls d metres in t seconds. d is directly proportional to the square of t. The ball drops 45 metres in the first 3 seconds. How far does the ball drop in the next 7 seconds?


In a sale, normal prices are reduced by 18%. The sale price of an umbrella is £25.83. Work out the normal price of the umbrella.


Perimeter of isoceles triangle is 24cm. Sides 'x' = x + 3, side 'y' = x + 2, calculate the area


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences