Factorise (p+q)²-20(p+q)-125.
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LET (P + Q) = M
WE HAVE M²-20M-125
=M²-25M+5M-125
=M(M-25)+5(M-25)
=(M+5) (M-25)
=(P+Q+5)(P+Q-25)
WE HAVE M²-20M-125
=M²-25M+5M-125
=M(M-25)+5(M-25)
=(M+5) (M-25)
=(P+Q+5)(P+Q-25)
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