Maths-

General

Easy

Question

# If the pair of lines intersect on the x-axis, then ac=

- g
^{2} - f
^{2} - fg
- 2g
^{2}

^{2}^{2}^{2}Hint:

### Put y=0 in the equation and then derive the expression.

## The correct answer is: g^{2}

### Given That:

If the pair of lines intersect on the x-axis, then ac=

>>> From unique point of intersection of pair of straight lines:

f^{2}-bc=0 and g^{2}-ac =0 when the pair of straight lines intersect at y-axis and x-axis respectively.

>>> Therefore, the given pair of straight lines intersect on the x-axis. Then,

g^{2} = ac .

>>>Therefore, the condition required is .

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## >>> Given equation is $x2+y2=r2.$ After rotation

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