Solve: a) 5t + 17 = 2. b) x^3 - 25 = 103 - x^3.

a) 5t + 17 = 2. We want to work out what t is. t = ?.To do this we need to get t on it's own, so first we move all the other numbers to equal t.We do this by subtracting 17 from both sides and we should find that 5t = -15.Now we have 5t but we need to divide both sides by 5 to get just the value of t, so since -15/5 = -3... t = -3.b) x3- 25 = 103 - x3. The same applies here, we want to find the value of x.So first we get all the x's on one side: 2x3 = 128Then we can half the value on both sides to find that x3 = 64.Now we need to get rid of the cube on the x, so must find the cube root of both sides. The cube root of 64 is 4. So x = 4.

JA
Answered by James A. Maths tutor

2681 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

Solve the following simulatenous equation to find the values of both x and y: 5x+2y=16 3x-y=14


Emma wants to buy a radio, the full price is £80. In the shop, she is given a discount. A year later, she sells the radio for £78, giving her a profit of 30% of what she bought it for the year before. What discount did she receive? (4)


Find the points that the graph "y = x^2 -4x -14" touches the x-axis


Make y the subject of the formula: p = √x+y/5


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