Question

6 and 7 factorise this question​

Answer 1

(1) 9x2y2-16

=(3xy)2_(4)2

=(3xy+4)(3xy-4)

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Answer 2

Answer:

vi) (3xy+4)(3xy-4)

vii)(x-y+z)(x-y-z)

Explanation:

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We know the algebraic identity:

a²-b²=(a+b)(a-b)

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vi) 9x²y²-16

= 3²x²y²-4²

= (3xy)²-4²

= (3xy+4)(3xy-4)

vii) (x²-2xy+y²)-z²

=(x-y)²-z²

= (x-y+z)(x-y-z)

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