Expand the following brackets: (2x + 1)(x + 3)
The FOIL technique (First, Outside, Inside, Last) is very useful when expanding out brackets. Using this method we have:2x * x = 2x2 (First)2x * 3 = 6x (Outside)1 * x = x (Inside)1 * 3 = 3 (Last)So overall we have: 2x2 + 6x + x + 3 = 2x2 + 7x + 3
BA
Related Maths GCSE answers
All answers ▸Expand and simplify: 3(4x+1)-5(3x-2)
Here is a right-angled triangle (base = 8cm and height = 9cm) and a rectangle (length = 16cm). The area of the rectangle is 6 times the area of the triangle. Work out the width of the rectangle.
An triangular prism has base xcm, height (x+4)cm and length 4xcm. Find the volume of the prism in terms of x. Find the volume when x=2cm.
Solve the following simultaneous equations. x^2 + 2y = 9, y = x + 3