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3x^2 + 7x - 13 = 0. What is x?

By using the quadratic quation, it can be deduced that x = 1.22 or x = -3.55
MS
Answered by Miranda S. • Maths tutor
5846 Views

Simplify the surd sqrt(48)

When simplifying surd expressions we want to look for square numbers that are factors of the number inside the square root. If we list the square numbers (which are numbers that are the result of squaring an...
MH
Answered by Matthew H. • Maths tutor
41404 Views

Rationalise the denominator and simplify: 10/3√5 (2 marks)

First of all, you need to read the question really carefully and look at how many marks it is worth. The question is worth two marks and it is asking you to do two things: firstly, you need to ‘rationalise t...
MP
Answered by Megan P. • Maths tutor
16566 Views

Solve: 4x + 5 = 6x - 13

4x+5=6x-13. Take 4x from both sides 5= 6x-4x-13 5=2x-13. On the right hand side, you have -13 value. Add 13, to make 0. Adding thirteen on right also adds thirteen on left. 5 + 13 = 2x - 13 + 13 18=2x. 2 tim...
YH
Answered by Yacine H. • Maths tutor
8463 Views

3x+5y=7 and 9x+11y=13. Solve to find the values of x and y that satisfy both equations.

As there are two unknowns we have to eliminate either the x or the y in order to be able to solve. You can see that in the first equation the x value is a multiple of the x value in the second equation. Ther...
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Answered by Georgina S. • Maths tutor
4517 Views