1.

2) x² + 2x - 5 = 0457272 +9y + 10 = 0 |​

Answer»

x² + 2X - 5 = 0

So, we have to find to it's zeroes by USING completing Square method.

x² + 2x - 5 = 0

we can write 2x = 2(x)(1)

x² + (2)(x)(1) + [ 1² - 1²] - 5 = 0

(x + 1)² - 1 - 5 = 0

[(x² + 2x + 1) = (x + 1)² , where, (a² + b² + 2ac = (a + b)²]

so,

(x + 1)² = 6

[taking Square Root both SIDE]

(x + 1) = ±√6

now there is TWO SITUATION

( 1 ) we have to take (+ve) sign.

So, answeer will be.

(x + 1) = √6

x = (√6 - 1)

( 2 ) we have to take (+ve) sign.

So, answeer will be.

(x + 1) = -√6

x = -(√6 + 1)


Discussion

No Comment Found

Related InterviewSolutions