Question

5. Factorise the following expressions:
9z2 – x2 - 4y2 + 4xy​

Answer 1

Step-by-step explanation:

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$9 {z}^{2} - {x}^{2} - 4 {y}^{2} + 4xy$

$9 {z}^{2} - ( {x}^{2} + 4 {y}^{2} - 4xy)$

$9 {z}^{2} - (x + 2y)^{2}$

$(3z - x + 2y)(3z - x - 2y)$

Answer 2

Answer:

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