Advertisements
Advertisements
Question
Factorise the given expression.
q2 − 10q + 21
Sum
Advertisements
Solution
q2 − 10q + 21
It can be observed that, 21 = (−7) × (−3) and (−7) + (−3) = − 10
∴ q2 − 10q + 21
= q2 − 7q − 3q + 21
= q (q − 7) − 3 (q − 7)
= (q − 7) (q − 3)
shaalaa.com
Is there an error in this question or solution?
APPEARS IN
RELATED QUESTIONS
Factorise the following expression.
a2 + 8a + 16
Factorise the following expression.
4x2 − 8x + 4
Factorise the following expression.
121b2 − 88bc + 16c2
Factorise the following expression.
(l + m)2 − 4lm (Hint: Expand (l + m)2 first)
Factorise.
(l + m)2 − (l − m)2
Factorise.
9x2y2 − 16
Factorise the expression.
7p2 + 21q2
Factorise the expression.
5y2 − 20y − 8z + 2yz
Factorise.
p4 − 81
Factorise.
x4 − (x − z)4
