I have no idea anyone have any idea

(-4,0) or (7,0)

Step-by-step explanation:

If it crosses, the x-axis, y-value would be 0.

=> x² - 3x - 28 = 0

=> x² - 7x + 4x - 28 = 0

=> x(x - 7) + 4(x - 7)

=> x = -4 or 7

Step-by-step explanation:

it cuts x-axis where y=0 or f(x)=0

x²-3x-28=0

x²-7x+4x-28=0

x(x-7)+4(x-7)=0

(x-7)(x+4)=0

x=7,-4it will cut x-axis at (-4,0) and (7,0)

hello i am doing good for you that it's summer in your country or state ; )

btw in my country we just have sun and rain as (because i live in the caribbean lol)

also, thx a lot for the points : )

(b) 240

step-by-step explanation:

first, we use the pythagorean formula using the given side lengths to find x. then we use x to find the side lengths. then we add the side lengths to find the perimeter.

pythagorean theorem formula:

a^2 + b^2 = c^2

(x - 20)^2 + (x - 40)^2 = x^2

x^2 - 40x + 400 + x^2 - 80x + 1600 = x^2

x^2 -120x + 2000 = 0

(x - 100)(x - 20) = 0

x - 100 = 0 or x - 20 = 0

x = 100 or x = 20

we see that the solution x = 20 must be discarded because it will give a negative side length and a side length of 0. the only valid solution is x = 100.

perimeter = sum of the lengths of the sides

perimeter = x + x - 20 + x - 40

perimeter = 3x - 60

replace x with 100.

perimeter = 3(100) - 60

perimeter = 300 - 60

perimeter = 240