4. What is the value of b2 - 4ac in the quadratic equation x° +5x-7 =0?
A-7
B. -3
C. 53
D. -53​


Sagot :

Answer:

the usual way to type a power is to use the ^ to show exponents,

e.g.

x^2 is "x squared"

0 = −2x^2 − 3x + 8 in standard form is

2x^2 + 3x - 8 = 0

so b^2 - 4ac = 9 - 4(2)(-8) = ..

4(x + 2)^2 = 36

divide both sides by 4

(x+2)^2 = 9

x+2 = ±√9

x = -2 ± 3

= -5 or 1

after looking at the above stuff, you should be able to answer your last question

Step-by-step explanation:

hope it helps