X² + 6x -12 = 0
x = -(6) +/- √((6)² - 4(1)(-12))
 2(1)
x = -6 +/- √(36 + 48)
 2
x = -6 +/- √(84)
 2
x = -6 +/- 2√(21)
 2
x = -3 + √(21)
x = -3 + √(21) x = -3 - √(21)

5 0

3 years ago

Help me please

Arturiano [62]

X^2 - xy + xy - Y^2
=
X^2 - Y^2

4 0

2 years ago

Should you use centimeters or inches to measure a desktop

Gelneren [198K]

Inches

centimeters would be too small

Good luck!

5 0

3 years ago

Read 2 more answers

Please answer it now in two minutes

Pepsi [2]

Answer:

m∠C = 90°

Step-by-step explanation:

Triangle BDC is a right triangle with the measure of angle D = 90°

By applying Cosine rule in the given triangle,

Since, Cosine of any angle in a right triangle is a ratio of Its adjacent side and Hypotenuse (Opposite side of the right angle)

CosC = $\frac{\text{Adjacent side}}{\text{Hypotenuse}}$

CosC = $\frac{\text{DC}}{\text{BC}}$

CosC = $\frac{7}{8}$

$C=\text{Cos}^{-1}(\frac{7}{8})$

C = 28.955

C = 29°

Therefore, m∠C = 29° will be the answer.

4 0

3 years ago