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Solve x^2 - 9 = 4x + 12

x 2 - 9 = 4x + 12 x 2 - 9 - 4x = 12 x 2 - 9 - 4x -12 = 0 x 2 - 4x -21 = 0 Factorise into form (x + ?)(x + ?) Factors of -21 are +7 and -3 or -7 and +3 (x + 7)(x - 3) = x 2 + 7x - 3x -21 = x 2 + 4x -21 which ...
KP
Answered by Kira P. • Maths tutor
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A group of 55 pupils were asked if they owned a phone or a tablet.11 people are known to own both18 said they only owned a tablet34 said they owned at least a phoneA student is picked a random, what is the probability that the student doesn’t have a phone

18/55
UH
Answered by Umer H. • Maths tutor
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When will I ever need to use this in real life?

Maths is something you can make use of for the rest of your life.Obviously, there are a vast number of jobs out there, such as engineering, which use mathematics everyday so if that's the sort of thing that ...
AM
Answered by Alex M. • Maths tutor
3750 Views

How do I solve the simultaneous equations 5x+2y=11 and 4x-3y=18?

Simultaneous equations have two or more unknown values, in this case there are two: x and y. To solve them, first we need to get one unknown by itself. In order to do this we need the coefficient of either x...
HT
Answered by Helen T. • Maths tutor
7869 Views

How do you sketch a quadratic graph?

There are three things to think about when sketching a quadratic graph: whether its a 'u' or 'n' shape, where it cuts across the y axis and where it cuts across the x axis (if it does). Let's look at an exam...
SP
Answered by Sita P. • Maths tutor
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