Question

Determine the x-intercepts of the quadratic function
f(x)= 2 x square + x -15

Answer 1

x intercept is a point common to both the `function` and the `x axis`

Answer 2

How do we have to solve this.

Answer 3

for points on x axis, the y value is 0

Answer 4

so simply set the y = f(x) to 0 and solve x

Answer 5

f(x) = 2x^2 + x - 15

set the function equal to 0 :
0 = 2x^2 + x - 15
solve x

Answer 6

looks it can be factored

Answer 7

ok

Answer 8

familar with factoring by grouping ?

Answer 9

no

Answer 10

wait for a secnd

Answer 11

see this nice short video
https://www.khanacademy.org/math/algebra/multiplying-factoring-expression/factoring-by-grouping/v/factor-by-grouping-and-factoring-completely

Answer 12

i know