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Solve the equation :21 x^2-28 x+10=0...

Solve the equation :`21 x^2-28 x+10=0`

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To solve the quadratic equation \( 21x^2 - 28x + 10 = 0 \), we will follow these steps: ### Step 1: Identify the coefficients The standard form of a quadratic equation is \( ax^2 + bx + c = 0 \). Here, we have: - \( a = 21 \) - \( b = -28 \) - \( c = 10 \) ...
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NCERT-COMPLEX NUMBERS AND QUADRATIC EQUATIONS-MISCELLANEOUS EXERCISE
  1. If x + i y =sqrt((a+i b)/(c+i d)) prove that (x^2+y^2)^2=(a^2+b^2)/(c^...

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  2. Find the number of non-zero integral solutions of the equation |1-i|^...

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  3. If (a + i b) (c + i d) (e + if) (g + i h) = A + i B, then show that (a...

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  4. Let z1=2-i ,z2=-2+i. Find Re ((z1z2)/( bar z'1))

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  5. Find the modulus and argument of the complex number (1+2i)/(1-3i).

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  6. If z1=2-i ,z2=1+i ,find |(z1+z2+1)/(z1-z2+i)|

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  7. If a + i b =((x+i)^2)/(2x^2+1),prove that a^2+b^2=((x^2+1)^2)/((2x^2+...

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  8. If alphaand betaare different complex numbers with |beta|=1,then fin...

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  9. Find the real numbers x and y if (x-i y)(3+5i) is the conjugate of -6...

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  10. Find the modulus of (1+i)/(1-i)-(1-i)/(1+i).

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  11. If (x+i y)^3=u+i v ,then Find p if u/x+v/y=p(x^2-y^2).

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  12. Convert the following in the polar form : (i) (1+7i)/((2-i)^2) (ii) ...

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  13. Solve the equation :x^2-2x+3/2=0

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  14. Solve the equation : 3x^2-4x+(20)/3=0

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  15. Evaluate : [i^(18)+(1/i)^(25)]^3

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  16. Reduce (1/(1-4i)-2/(1+i))((3-4i)/(5+i))to the standard form.

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  17. For any two complex numbers z1and z2, prove that Re(z1z2)=Re(z1) Re(z2...

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  18. Solve the equation :21 x^2-28 x+10=0

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  19. Solve the equation :27 x^2-10 x+1=0

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  20. If ((1+i)/(1-i))^m=1,then find the least integral value of m.

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