Question

find the value of the discriminant for the quadratic equation
$x {}^{2} + 10x \\ - 7 = 0$

Answer 1

$x ^{2} - 5x - 2x - 10 = 0 \\ x(x - 5) - 2(x - 5) = 0 \\ (x - 2)(x - 5) = 0 \\ x = 2 \: or \: 5$

Answer 2

Answer:

128

Step-by-step explanation:

D= b²-4ac

Therefore,

10²-(4*1*-7) = 100+28

=128

=D