Expand and simplify (3 + 4*root5)(3 - 2*root5)
Using FOIL to expand the brackets we get
9 - 6root5 + 12root5 + 8*root5^2
Square rooting then squaring a number cancels out, so we are left with 8*5 or 40 for the last term.
Simplify to give
9 + 6*root5 + 40
6*root5 + 49
CM
Related Maths A Level answers
All answers ▸Find the exact solution to: ln(x) + ln(7) = ln(21)
How to perform integration by substitution. (e.g. Find the integral of (2x)/((4+(3(x^2)))^2)) (10 marks)
Consider the function F(x)=17(x^4)+13(x^3)+12(x^2)+7x+2. A) differentiate F(x) B)What is the gradient at the point (2,440)
Integrate 4x^3 - 3x + 6