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 ▸How do I factorise 3xy^2 – 6xy fully?
How would you answer a frequency tree question such as '400 people were asked if they drink orange juice, 8/10 say yes, 25% of these say yes to drinking 3 cups a day. Complete the frequency diagram.'?
Divide £700 in the ratio 5:3:2
Find the two solutions to the quadratic equation x^2-9x+18