The equation x^3+x^2+ax-4=0 has one root equal to -2. Find the value of a.
1 answer:
Answer:
a = - 4
Step-by-step explanation:
Given x = - 2 is a root then f(- 2) = 0
f(x) = x³ + x² + ax - 4, thus
f(- 2) = (- 2)³ + (- 2)² - 2a - 4 = 0, that is
f(- 2) = - 8 + 4 - 2a - 4 = 0, thus
- 8 - 2a = 0 ( add 8 to both sides )
- 2a = 8 ( divide both sides by - 2 )
a = - 4
You might be interested in
That’s a rational number because it’s decimal form terminates
Answer:
10000000
Step-by-step explanation: Multiply 10*10*10*10*10*10*10
I think it box c or box a. It you have to do the math sorry but wish you luck tho
Answer:
4(3x-10)
Step-by-step explanation:
12x-40 = (4*3)x-(4*10) = 4(3x-10). The GCF is 4.
Answer:
3x² + 6
Step-by-step explanation:
i think?
