# Search results

1. ### Maxima question needs checking

question a rectangular plot of land requires fencing on all 4 sides. two opposite sides will use heavy duty fencing at £6/metre, whilst the other tow sides will use standard fencing at £3/metre. if the farmer buying the fencing has £5000 to spend, what is the maximum area he can enclose...
2. ### Trig identity question need checking

1. cos(2x+y) = cos(a+b) = sinasinb + cosacosb = (2x+y) = sin2xsiny + cos2xcosy = sin2x = 2sinxcosx and cos2x = cos2x-sin2x = cos(2x+y) = (cos2x-sin2x)cosy - (2sinxcosx and cos2x)siny (is this correct) 2. evaluate the following exactly (use \sqrt{} in your answer where necessary) cos...
3. ### Logarithms questions need checking

1. ln (x2 / y2) = log (A / B) = logA-logB = logx2-logy2 = 2logx - 2logy (is this correct) 2. can this expression be split into seperate log functions and numbers, is this question the answer log(2x + 3y) = log(2x + 3y) (is this correct)
4. ### Is this algebraic expression correct

a(a-6) + 9 = 0 a2 - 6a + 9 = 0 (a - 3)(a - 3) = 0 a = -3 is this correct
5. ### Graph problem

thanks, but how do i solve them, so ur saying 4 example; y = 3 / 2x + 3 -> y = 3(2x + 3) is that what u mean ?
6. ### Graph problem

how do i find x and y intercepts
7. ### Graph problem

hey guys, stuck on a few question, but dnt tell me the answer, direct me please :) how do i find the intercepts for; 1. y = 1 / x -1 2. y = 2 / x + 1 3. y = 3 / 2x + 3 cheers guys :):)