Q3 of 53 Page 77

Factorise:

x2 + 14x + 49

using (x + y)2 = x2 + 2xy + y2

= x2 + 2 × 7 × x + 7 × 7


= (x + 7)2


= (x + 7)(x + 7)


More from this chapter

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2

Factorise:

a2 – 3a – 40

 2

Factorise:

x2 – x – 72

 3

Factorise:

4x2 + 4x + 1

 3

Factorise:

a2 – 10a + 25