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Show that the equation 3x^(2)+7x+8=0 is ...

Show that the equation `3x^(2)+7x+8=0` is not true for any real value of x.

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Verified by Experts

The given equation is `3x^(2)+7x+8=0.`
`:." "D=(7^(2)-4xx3xx8)=(49-96)=-47lt0.`
So, the given equation has no real roots.
Hence, the given equation is not true for any real value of x.
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RS AGGARWAL-QUADRATIC EQUATIONS -Test Yourself
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  3. Which of the following is a quadratic equation ?

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  4. Which of the following is not a quadratic equation?

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  6. If one root of the equation 2x^(2)+ax+6=0 is 2 then a=?

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  7. The sum of the roots of the equation x^(2)-6x+2=0 is

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  8. If the product of the roots of the equation x^(2)-3x+k=10 is -2 then t...

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  9. The ratio of the sum and product of the roots of the equation 7x^(2)-1...

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  11. If one root of 5x^(2)+13x+k=0 be the reciprocal of the other root then...

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  14. If the sum of the roots of aquadratic equation is 6 and their product...

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  15. If alpha and beta are the roots of the equation 3x^(2)+8x+2=0 then ((1...

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  16. The roots of the equation ax^(2)+bx+c=0 will be reciprocal of each oth...

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  17. If the roots of the equation ax^(2)+bx+c=0 are equal then c=?

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  18. If the equation 9x^(2)+6kx+4=0 has equal roots then k=?

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  20. If the equation 4x^(2)-3kx+1=0 has equal roots then k=?

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