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How do you use the quadratic formula?

The equation for the quadratic formula is x = (-b +/- √( b^2 - 4ac))/2a for when the equation ax^2 + bx + c is equal to 0. When you have the equation ax^2 + bx + c, where a, b and c are given numbers, you ca...
IB
Answered by Isla B. • Maths tutor
2828 Views

Simplify: 5x + 8y - 3x + 9y

When you first come across algebra, it may be a bit tricky to get your head around as it involves more abstract concepts than we may have previously seen in maths. However, once you understand the basic prin...
KS
Answered by Katharine S. • Maths tutor
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Write sqrt(75) in simplified surd form.

First you want to find a square number that is a factor of 75. In this case it is 25, as 25 x 3 = 75 . With this information you can expand the surd into:sqrt(25) x sqrt(3) As 5^2 = 25, this can become:5 x s...
KG
Answered by Kate G. • Maths tutor
7573 Views

Here are three expressions. b/a, a – b, and ab. When a = 2 and b = -6, which expression has the smallest value?

b/a = -6 / 2 = -3 ......... a - b = 2 - (-6) = 8 ............ ab = 2 x -6 = -12 ...............Therefore ab , -12, has the smallest value.
TM
Answered by Tara M. • Maths tutor
5946 Views

Factorise x^2 +7x +10

First, you need to look at the x 2 term and the number 10 - find all the factors of these numbersThe number before x 2 is 1, and since 1 is a prime number, the only factor is 1. 1=1x1As for the number 10: 10...
SA
Answered by Sophie A. • Maths tutor
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