<span>2k² = 9 + 3k
⇒ </span><span>2k² - 9 - 3k
= 0
⇒ 2k² - 3k -9 = 0
b² - 4ac = 3² - 4*2*(-9) = 81>0
It has 2 real roots.
</span>
Answer:
More info?
Step-by-step explanation:
If you mean how to find out each one, then
SAS: a side /, an angle <, a side /.
SSS: a side /, a side /, a side /.
AAS: an angle <, an angle <, a side /.
Answer:
One hour and fourty five minutes.
Supplementary and Adjacent. Because their sum must equal 180 degrees.
Answer:
x = -2
x = -9
Step-by-step explanation:
The linear system is:
8x - 4y = 20 ⇒ (1)
5x - 8y = 62 ⇒ (2)
To solve the system multiply equation (1) by -2 to make the coefficients of y equal in values and different in signs, then add the resulting equation with equation (2)
∵ -2(8x) + -2(-4y) = -2(20)
∴ -16x + 8y = -40 ⇒ (3)
- Add equation (2) and (3)
∴ -11x = 22
- Divide both sides by -11
∴ x = -2
Substitute the value of x in equation (1) or (2)
∵ 8(-2) - 4y = 20
∴ -16 - 4y = 20
- Add 16 to both sides
∴ - 4y = 36
- Divide both sides by -4
∴ y = -9