factorise:(p+q)sqare-20(p+q)-125
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(p+q)²-20(p+q)-125
let (p+q) be A
a²- 20a - 125
a² + 5a - 25a- 125
a(a+5) -25 (a+5)
(a-25) (a+5)
(p+q-25) (p+q+5)
let (p+q) be A
a²- 20a - 125
a² + 5a - 25a- 125
a(a+5) -25 (a+5)
(a-25) (a+5)
(p+q-25) (p+q+5)
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