Question

Factorise 10p -21 - p^2

Answer 1

Answer:

i)a2+8a+16

=a(a+4)+4(a+4)

=(a+4)(a+4)

(ii) p2−10p+25 

=p(p−5)−5(p−5)

=(p−5)(p−5)

(iii) 25m2+30m+9 

=5m(5m+3)+3(5m+3)

=(5m+3)(5m+3)

(iv) 49y2+84yz+36z2 

=49y2+42yz+42yz+36z2

=7y(7y+6z)+6z(7y+6z)

=(7y+6z)(7y+6z)

(v) 4x2−8x+4 

=(4x−4)(x−1)

=4(x−1)(x−1)

(vi) 121b2−88bc+16c2 

=(11b−4c)(