Question

Factorise
b²-25
9t²-121
4k²-r²
3m²-27n²
45p²-125q²
1-$\frac{9}{16}$g²
2$\frac{2}{49}$h²-169

Answer 1

Answer:

• (b-5)^2

b^2 -10b + 25

• (3t -11)^2

9t^2 +121 -66t^2

• (2k -r)^2

4k^2 -4kr+r^2

• 3 (m^2 -9n^2)

3 (m^2) -(3n^2)

3 (m^2 -3n^2)(m^2 + 3n^2)

• 5 ( 9p^2 -25 q^2)

5 (3p - 5q)(3p+5q)