Look up "difference of squares"
Each of your questions is a basic example of that type.
how would you factorise
a) 9x^2 - 49
b) 9x^2 - 121
c) 49x^2 - 25x^2
thankyou
1 answer
a) 9x^2 - 49
b) 9x^2 - 121
c) 49x^2 - 25x^2
thankyou
1 answer