Question

2z²+ 72+4=0 completing the squarex= b²+ √b²+4ac/ 2a this is formula Please help i have urgent​

Answer 1

Step-by-step explanation:

x= b²+ √b²+4ac/ 2a This is not the formula.

the formula is → x = [-b ± √(b²-4ac)] / 2a.

[ When, ax²+bx+c=0, and (a≠0) ]

now,

2z²+ 72z+4=0 ( you forget 72]

or, z²+36z+2=0

or, z = [-36±√(1296 - 8)]/2.

Sorry, there are some mistake in the sum.