Question

how many real number solutions does the equation have?

Answer 1

\[y=5x ^{2}+8x-7\]

Answer 2

@iambatman um no test. i don't cheat. it's for practice.

Answer 3

For ax^2 + bx + c

Find the discriminant, b^2 - 4ac

Answer 4

If b^2 - 4ac > 0 then there is 2 real solutions

If b^2 - 4ac = 0 then there is 1 real solution

If b^2 - 4ac < 0 then there is no real solutions

Answer 5

'is' should be 'are' in the first and last line, but I ain't no dang grammar teacher

Answer 6

@agent0smith LOL but I don't get it?

Answer 7

For ax^2 + bx + c

Find the discriminant, b^2 - 4ac

You have 5x^2 + 8x − 7

Answer 8

@agent0smith so it would be 8^2-4(5)(-7) ??

Answer 9

since the y-intercept is (0,-7) which means below the x-axis, and the parabola opens up, there are two real solutions. No need to use discriminant

Answer 10

^true

Answer 11

@sourwing okay so there would be 2 solutions?

Answer 12

yea

Answer 13

8^2-4(5)(-7) = a positive number, which also from above tells you two solutions, from

If b^2 - 4ac > 0 then there is 2 real solutions

If b^2 - 4ac = 0 then there is 1 real solution

If b^2 - 4ac < 0 then there is no real solutions

Answer 14

@sourwing okay thank u <3