solve this equation: 4(x-5)=x+7
Firstly, I will provide a 'mark scheme' type answer.
Then there is a full explanation available underneath. 4 (x-5)=x+7. 4x-20=x+7. 3x=27. x=9. A full explanation: 4(x-5)=x+7 (expand the equation on the left. TOP TIP: pretend there is a multiplication sign between 4 and the phrase of (x-5) :) Therefore, mutliply x by 4 and then multiply 4 and -5.) 4x-20=x+7. (Take x away from both sides). Therefore you will end up with: 4x-x-20=7. THEREFORE 3x-20=7. (Add 20 to both sides) 3x=7+20 3x=27. (Divide by 3 for both sides) x= 27/3 x=9
AM
Related Maths GCSE answers
All answers ▸A plane flew from Frankfurt to Hong Kong. The flight time was 10hours 45minutes. The average speed was 852km/h. Work out the distance the plane flew.
How to factorise a quadratic with a coefficient of x^2 greater than one, for example 4x2+4x-15?
Write 2x^2 - 16x + 6 in the form a(x + b)^2 + c where a, b and c are constants to be determined.
Solve these simultaneous equations: 3y + x = 18 and x - 4y = -10.