How do you solve #3z ^ { 2} + 4z  7= 0#?
2 Answers
Apr 4, 2018
Explanation:
Using the quadratic equation
you get
Apr 4, 2018
1, and
Explanation:
Use shortcut when a + b + c = 0
Reminder of shortcut >

When a + b + c = 0
#x1 = 1# , and#x2 = c/a#
Example:#y = 3x^2 + 4x  7 = 0#
#x1 = 1# , and#x2 =  7/3# 
When a  b + c = 0.
x1 =  1, and#x2 =  c/a#
Example.#y = 5x^2 + 3x  2x = 0#
#x1 =  1# , and#x2 = c/a = 2/5#