a²-9a+20 factorise
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Answered by
1
Step-by-step explanation:
a²-9a+20
By using middle spilting term
= a²-5a-4a+20
= a(a-5)-4(a-5)
= (a-5) (a-4)
a= 5 or a= 4
correct explanation
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Answered by
6
Answer:
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Step-by-step explanation:
a² - 9a + 20 = 0
a² - 5a - 4a + 20 = 0
a(a - 5) - 4(a - 5) = 0
(a - 5) (a - 4) = 0
∴a - 5 = 0
a = 5
(or)
∴a - 4 = 0
a = 4
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