Hi I really really need help, I've got this maths homework due tomorrow and I'm not sure what to do on a few and if I've even done a few right could someone please please have a look! Thank you!!
I can't attach images so I'll type it out:
1) Factorise each quadratic
a)5x^2 + 5x - 10
My answer: I divided by 5, x^2 + x - 2 answer = (x+2)(x-1)
b)15x^2 - 72x - 15
My answer: Divided by 3, 5x^2 - 24 - 5 = (-5+x)(5x-1)
Solve: 3 * 4^(2k+8) = 24
IDK WHAT TO DO!
Factorise fully (w+4)^3 - (w+4)^2(w+1)
HELP! This one I expanded until I eventually got 3w^2 +16w +48 but it doesn't facatorise and I'm gonna cry because someone I know got: 3(w+4)^2 and I don't understand!
Last question:
y = 16 * 10^(8k) where k is an integer
find an expression, in terms of k, for y^(5/4)
Give answer in standard form