Question

5) Factorise r2 + 9r + 20
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Answer 1

Answer:

r=-5,-4

Step-by-step explanation:

r²+9r+20

r²+5r+4r+20

r(r+5)+4(r+5)

r+5=0

r=-5

r+5=0

r+4=0

r=-4

Answer 2

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• r² + 9r + 20 = (r + 5)(r + 4)

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Explanation is in the Attachment ✔️✔️✔️

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