x^2+2=18, find the value of x.

This is a basic rearranging of the equation that easily catches students out and will generally be offered 3 marks. The first thing to do is take the 2 on the other side of the equation so we get x^2=16. From this points all we have to do is take root of 16. However what students easily forget is that there are always 2 roots of positive numbers one being the original root and one being its negative counterpart. Experienced students should remember this and thus get the answer that x=4 or x=-4.

Answered by Ishaan P. Maths tutor

2134 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

Solve the simultaneous equation: 3x+2y=8 and 2x+5y=-2


f(x) = 4x - m, g(x) = mx + 11, fg(x) = 8x + n. m and n are constants. Find the value of n.


Make x the subject of the formula y=(4x+5)/x


The perimeter of a right-angled triangle is 60 cm. The lengths of its sides are in the ratio 3 : 4 : 5. Calculate the area of the triangle.


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 2013–2024

Terms & Conditions|Privacy Policy
Cookie Preferences