Question

Sum of zeroes of a quadratic polynomial is 2xsquare+ 4x- 8 is?

Answer 1

$2x^2+4x-8=0\\\\x^2+2x-4=0\\\\a=1\\\\b=2\\\\c=-4\\\\D=b^2-4ac\\\\D=4+16=20$

x = ( -b ± √D ) / 2a

x = ( -2 ± √20 ) / 2

x = ( -2 ± 2√5 ) / 2

x = -1 ± √5

Sum of zeroes = ( -1 + √5 ) + ( -1 - √5 )

= -1 - 1 = -2

Sum of zeroes of a quadratic polynomial 2x²+ 4x - 8 is -2 .