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How do I expand (x - 4)(2x + 3y)^2 ?

To start off, to make things clearer we can write the expression as:(x - 4)(2x + 3y)(2x + 3y)Now focus on just two of the brackets, say (2x + 3y)(2x + 3y). To expand this, we need to do the following four...

Answered by Hector M. • Maths tutor

4604 Views

Calculate the length of PR. Give your answer correct to 3 significant figures (Diagram displayed on whiteboard)

In order to work out the unknown length of the triangle side PR, we first must identify which trigonometry equation to use. The digram gives us three values- 1 side and 2 angles. We know the hypotenuse (t...

Answered by Ali A. • Maths tutor

12518 Views

The value of a car depreciates by 35% each year. At the end of 2007 it was £5460. Work out the value of the car at the end of 2006.

-This question wants us to work backwards.Let N be the value of the car in the year 2006. Find the multiplier . 1-0.35 = 0.65. Hence N * (0.65) = £5460. Rearrange for N. N = £8400

Answered by Rithvik G. • Maths tutor

9951 Views

The second and fifth terms of a geometric series are 750 and -6 respectively. Find: (1) the common ratio; (2) the first term of the series; (3) the sum to infinity of the series

x_n = ar^(n-1)(1) x₂= 750 = ar¹(2) x₅= -6 = ar⁴divide second equation by first-6/750 = r³r³= -0.008r= -0.2Insert in...

Answered by Henry P. • Maths tutor

5546 Views

How do you factorise a quadratic equation where the coefficient of x^2 isn't 1?

For this, we need to use the formula ax²+bx+c. Multiply the coefficient of a from your equation with the value of c. This gives you a value from which you need to find 2 factors of this value w...

Answered by Rosie G. • Maths tutor

5310 Views