Find which of the following equations are quadratic :
5x2 - 8x = -3(7 - 2x)
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⇒ 5x2 - 8x = -21 + 6x
⇒ 5x2 - 8x - 6x + 21 = 0
⇒ 5x2 - 14x + 21 = 0 which is of the form ax2 + bx + c = 0.
∴ Given equation is a quadratic equation.
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The equation 2x2 - 3x + k = 0 is satisfied by x = 2; the value of k is :
-2
2
4
3
If x2 - 7x = 0; the value of x is :
0 and 7
7
0
0 or 7
(x - 4)(3x + 1) = (3x - 1)(x + 2)
7x3 - 2x2 + 10 = (2x - 5)2