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how to solve a quadratic inequality

in the case you have ax 2 +bx+c>n where a,b,c and n are all real integers (non fractions, ration numbers that can be +ve or -ve) use the quadratic formula [-b+/-(b 2 -(4c)) 1/2 ]/2a to first find the root...
JB
Answered by J B. • Maths tutor
3177 Views

A is (2, 12) and B is (8, 2) Calculate the midpoint of AB.

Find the difference between the x co-ordinates and divide by two, apply the same principle to the y co-ordinates Answer: (5,7)
AD
Answered by Ashan D. • Maths tutor
7864 Views

Solve the simultaneous equations: 6x + 3y = 42 4x + 7y = 38

6x + 3y = 42 => y = 14 - 2x (1 method mark)4x + 7y = 38 (substituting in y) => (1 method mark) 4x + 7(14 - 2x) = 384x + 98 - 14x = 38-10x + 98 = 3860 = 10x => x = 6 (1 answer mark) => y = 14 - 2(...
DT
Answered by Daniel T. • Maths tutor
4140 Views

What are surds and how do I use them ?

Surds are irrational numbers, (numbers which cannot be expressed as fractions), and normally shown as a number instead a square root, but the number itself isn't a square. For example root 3 is a surd, while...
RH
Answered by Roly H. • Maths tutor
7335 Views

How do you solve the equation 3(6x + 2) = 10 + 4x?

Begin by expanding the brackets of the LHS:3(6x + 2) = 18x + 6 3 * 6x = 18 x and 3 *2 = 6The equation now reads:18x + 6 = 10 + 4xSubtract 4x from both sides14x + 6 = 10Subtract 6 from both sides14x = 4Divide...
JT
Answered by James T. • Maths tutor
3644 Views