Calculate (7 + √3)(7 - √3)
(7 + √3)(7 - √3) = 72 + 7√3 - 7√3 - (√3)2 = 49 - 3 = 46Alternatively you can go straight to identifying that this is the difference between two squares, using the fact that (a + b)(a - b) = a2 - b2
IB
Related Maths GCSE answers
All answers ▸Express 60 as a product of its prime factors.
A right angled triangle has sides of length 3 and length 4, what is the length of the hypotenuse?
Gemma wants to buy an equal number of pencils and rulers. Find how many of each she is able to purchase with £5. Use the price list below.
what is: a) 1/3 +1/4 ? b) 4/6 + 3/12?