Question

factorise by splitting the middle term ?
(a) p2+ 6p - 16
(b) q2- 10q+21
(c) x2-18x +81

Answer 1

Here is your answer.
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Answer 2

a)

p²+ 8p - 2p - 16

p(p+8) -2(p+8)

(p+8)(p-2)

b)

q²-7q-3q +21

q(q-7) -3(q-7)

(q-7) (q-3)

c)

x²-9x -9x +81

x(x-9)-9(x -9)

(x-9)(x-9)