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a square -25-ab+5b factorisation

Sagot :

Answer:

(a - 5)(a + 5 - b)

Step-by-step explanation:

given

a² - 25 - ab + 5b

a² - 25 is a difference of squares

= (a - 5)(a + 5) - ab + 5ab ← factor out - b from second/ third terms

= (a - 5)(a + 5) - b(a - 5) ← factor out (a - 5) from each term

= (a - 5)(a + 5 - b)