when 19 times a natural number is added to twice to its square , then their sum is 231 . find the numbers
Answers
Answered by
1
Answer:
19 × 19
Step-by-step explanation:
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Answered by
0
Answer:
Let the number be x
Given
x is added to twice its x
2
gives 21
2x
2
+x=21
⟹2x
2
+x−21=0
⟹2x
2
+7x−6x−21=0
⟹x(2x+7)−3(2x+7)=0
⟹(x−3)(2x+7)=0
⟹x=3,−
2
7
The number is 3,−
2
7
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