Top answers

Solve n^2+n-90=0 to find the value of n?

Using the quadratic formula with a calculator a=1 b=1 c=-90 answers are n=-10 and n=9Factorising (n-9)(n+10)=0 answers are n=-10 and n=9
AL
Answered by Asher L. • Maths tutor
8265 Views

Solve these simultaneous equations.....3a+2b = 17 and 8a-2b= 60

3a+2b = 178a-2b = 60We are going to solve this using the elimination method. This means that we are going to eliminate the variable (or letter) that has the same value in each equation. In this case it is th...
JO
Answered by Joel O. • Maths tutor
6285 Views

Solve the equation x^2 + 10x + 24 = 0

x 2 + 10x + 24 = 0 First we must factorise the equation, which means put it into brackets. To do this we must find two numbers which multiply to equal 24 and add together to make 10. The only two numbers tha...
AA
Answered by Archie A. • Maths tutor
13530 Views

Sophie had 3 piles of coins, A, B and C. Altogether there was £72. Pile B had twice as much as pile A. Pile C had three times as much as pile B. How much money was in Pile C?

A + B + C = £722A = B3B = C0.5 B + B + 3B = £724.5 B = £72B = £16C = £48
SR
Answered by Saleema R. • Maths tutor
3101 Views

Express x^2+2x+4 in the form (x+a)^2 + b, hence find the stationary point of the curve.

Step 1) x 2 +2x+4 = (x+1) 2 +3Step 2) Minimum point occurs at (-1, 3) I can use the whiteboard to explain it better.
AN
Answered by Anton N. • Maths tutor
7061 Views