Answer:
f(x) = x² - 2x - 15
Step-by-step explanation:
∵ The function intersect x-axis at -3 and 5
∴ f(x) = 0 at x = -3 , 5
∵ The form of the quadratic equation is ⇒ ax² + -b/a x + c/a = 0
ax² - b/a x + c/a = 0
Where the sum of its roots is b/a and their multiplication is c/a
∵ a = 1
∵ -3 , 5 are the roots of the quadratic equation
∴ b = -3 + 5 = 2
∴ c = -3 × 5 = -15
∴ f(x) = x² - 2x - 15
Answer:
-18 + 6j
Step-by-step explanation:
3 * -6 is -18
3 * 2j is 6j
Answer:They spend 8 hours
Step-by-step explanation:2.9 times 3
If 8 divided by four is two and that means there's two for each, then you would have three because 3 times two equals 6. So the answers 3 I think.
Since 1/3 of x is 12, it can also be expressed as x/3 = 12, and we can use multiplication to find x
12 x 3 = 36
1/2 of 36 is 18
