Question

Which part of the quadratic formula tells you whether the quadratic equation can be solved by factoring?

−b b2 − 4ac 2a

Use the part of the quadratic formula that you chose above and find its value given the following quadratic equation:

2x2 + 7x + 3 = 0

Answer 1

b2 − 4ac
2x2 + 7x + 3 = 0
(7)^2-4(2)(3)
49-24
25
as 25 is a perfect square so the quadratic equation can be solved by factorisation

Answer 2

b2-4ac, value here 25

Answer 3

for ax^2+bx+c=0
b^2-4ac is the part that can tell
7^2-4*2*3 = 25