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but no body explained whts a number line test method?

sabita

z^2 - 4 <0 z^2 < 4 since z^2 is +ve, it is >0 but less than 4. so z must be in between -2 and 2 excluding. if you draw a line and put these values on the number line, you will see where z lies. _________________

Z^2-4 < 0 add 4 to both sides z^2 < 4 Take the square root of both sides z < 2 and z > -2 Remember when you take the square root of an inequality, the negative sign flips the inequality