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प्रश्न
Solve the following quadratic equation by factorization method
`sqrt("a"("a" - 7)) = 3sqrt(2)`
उत्तर
`sqrt("a"("a" - 7)) = 3sqrt(2)`
Squaring on both sides
a(a – 7) = `(3sqrt(2))^2`
a2 – 7a = 18
a2 – 7a – 18 = 0
(a – 9) (a + 2) = 0
a – 9 = 0 or a + 2 = 0
The roots are – 2 and 9
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