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Factorise 3x^2+15x

Firstly we need to understand what the question is asking us to do. Factorise means we need to take out the Highest Common Factor (HCF) that each term can be divided by.The two terms in this question is 3x 2...
HC
Answered by Hinesh C. • Maths tutor
4925 Views

What is the inverse of a function and how do you find it?

A function, f(x), is something that takes various input values of x, and for each one, generates an output value, e.g. if f(x) = x 2 then when x=3, f(x) = f(3) = (3) 2 = 9, which is the output of the functio...
JM
Answered by Jack M. • Maths tutor
4334 Views

The perimeter of a right-angled triangle is 72 cm. The lengths of its sides are in the ratio 3 : 4 : 5 Work out the area of the triangle.

Work out the lengths of each side; do so by adding the ratio components together (3+4+5).The components add to 12; we can now find the value of a single unit of the ratio, by dividing 72 by 12.72/12 is 6; ea...
LF
Answered by Lorissa F. • Maths tutor
3668 Views

Simultaneous Equation: 3x + y = -4 / 3x - 4y = 6

Route 1 (Standard): 1. 3x + y = -4 / 2. 3x - 4y = 6 / MINUS 2 FROM 1 / y - (-4y) = 5y / -4 - 6 = - 10 / 5y = - 10 / y = -2 /PUT y-VALUE BACK INTO ORIGINAL EQ / 3x - 2 = -4 / 3x = - 4 + 2 / 3x = -2 / x = - 2/...
Answered by • Maths tutor
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2(x+4)=x+10

When solving equations like this, the most important thing to remember is that you must do the same thing to both sides. First multiply out the brackets, multiplying the x and the 4 by 2, giving 2x+8=x+10. W...
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Answered by Mimi H. • Maths tutor
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