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Find the value of x which satisfies the following equation 3 x2 + 6 x + 3 = 0

3 x 2 + 6 x + 3 = 0 . .../3 x 2 + 2 x + 1 = 0(x+1) 2 =0x+1=0x=-1PROOF3 (-1) 2 + 6 (-1) + 3 = 0
CT
Answered by Catherine T. • Maths tutor
3396 Views

Peter is 180cm tall, correct to 2 significant figures. Alice is 150cm tall, correct to 2 significant figures. What is the upper and lower bound of the difference in their heights?

Upper bound of Peter's height = 185cmLower bound of Peter's height = 175cmUpper bound of Alice's height = 155cmLower bound of Alice's height = 145cmFor the upper bound of the difference, we want the upper bo...
JT
Answered by James T. • Maths tutor
4060 Views

320 people go on a coach trip. Each trip holds 53 people. Gary says 6 coaches are needed. Is Gary correct?

53 x 6 = 318320-318 = 2There are not enough coaches for the amount of people. 2 people would not be on a coach. 7 coaches are needed to ensure everyone has a seat on a coach.
AE
Answered by Arthur E. • Maths tutor
7519 Views

How to complete the square

Completing the square refers to the process of rewriting a general quadratic expression into the form of a(x+b) 2 + c .For example we are asked to complete the square for 2x 2 + 4x + 5. The best way to do th...
ZZ
Answered by Zitong Z. • Maths tutor
6867 Views

What is the pythagoras theorem?

a 2 =b 2 +c 2
AF
Answered by Anwen F. • Maths tutor
3166 Views