math
posted by harry on .
factorise
1. 3a^2  2a  8
2. 3x^2 + 31 + 10
3. 64y^2  49
please help
thankyou

well, 6 and 4 differ by 2
so
(3a+4)(a2)
I need 30 and 1 so
(3x+1)(x+10)
difference of 2 squares
a^2b^2 = (ab)(a+b)
here a = 8y and b = 7