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Using the following quadratic equation, find x: x2 + 3x -4

x 2 +3x -4. (x + a) (x - b) x has no co-efficient so each is 1 x. next find two numbers with a product of -4 and a sum of +3. cannot be 2,2 as these numbers have a sum of -4, 0 or +4 depending on whether the...
JC
Answered by Jake C. • Maths tutor
4433 Views

Why do square roots have more than 1 solution?

As 3 2 is equivalent to (-3) 2 it follows that the square root of 9 must be + or -3.
MH
Answered by Masudul H. • Maths tutor
3602 Views

The area of this rectangle is 56 cm2 length = 3k+2 and width = 7 - Find the value of k

The first step in answering any maths question is to identify key words or key information. Key information is area, length and width. We have been told that the total area is 56cm2. We know that area is len...
AB
Answered by Ayat B. • Maths tutor
3804 Views

How do you simplify the square root of 18 without using a calculator?

Surds can be simplified if the number in the square root has a square number as a factor. It is also worth remembering that SQRT(ab) = SQRT(a) x SQRT(b). So if you combine these two points, lets look at how ...
RB
Answered by Richard B. • Maths tutor
10930 Views

Solve the following pair of simultaneous equations 1)x+3y=11 2)3x+y=9

Rearrange equation 2 to make y the subject, then substitute the y expression into equation 1 and collect like terms: 3x+y=9 -->> y =9-3x x+3 y =11 -->> x+3(9-3x)=11 -->> x+27-9x=11 -->&g...
TD
Answered by Tutor94832 D. • Maths tutor
8133 Views