Math, asked by tineshtinesh61, 11 months ago

By using factorization method only​

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Answers

Answered by pinkiamrishbhaipatel
1

Answer:

a = 9, a = - 2

Step-by-step explanation:

 \sqrt{a (a - 7)}  = 3 \sqrt{2}  \\   \sqrt{ {a}^{2}  - 7a}  = 3 \sqrt{2}  \\  {a}^{2}  - 7a =  {3 \sqrt{2} }^{2}  \\  {a }^{2}  - 7a = 18 \\  {a}^{2}  - 7a - 18 = 0 \\  {a}^{2}  - 9a + 2a - 18 = 0 \\ a(a - 9) + 2(a - 9) = 0 \\ ( a- 9) + ( a+ 2) = 0 \\ (a - 9) = 0  \\ (a + 2) = 0 \\ (a = 9)(a =  - 2)

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