Question

(ii) y2 - 10y+25
(iv) m² + m - 72 factorise the following​

Answer 1

Answer:

a)y^2-5y-5y+25

y (y-5)-5 (y-5)

(y-5)(y-5)

b) m^2+m-72

m^2+9m-8m-72

m (m+9)-8 (m+9)

(m-8 )(m+9)

Answer 2

y2-10y+25

= y2 - 2(5)y + 25 - 25

= (y-5)^2

= (y-5)(y-5)

m2 + m - 72

m2 + 2(1/2)m + 1/4 - 289/4

= (m+1/2)^2 - (17/2)^2

= [m+9][m-8]