3 years ago

Please help with this!! i already did a bit idk if its right tho

Mathematics

1 answer:

Irina-Kira [14]3 years ago

6 0

What is it? You didn’t post anything?

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. Multiply (x + 3)(x – 3).

konstantin123 [22]

X × x = x^2
x × -3 = -3x
3 × x = 3x
3 × -3 = -9

x^2 + 3x - 3x - 9
So I would agree with C because the -3x and the 3x cancel each other out. I hope this helps!

8 0

3 years ago

Help PLEASE!!! Find X for the triangle.

aleksklad [387]

Answer:

Step-by-step explanation:

$Hypotenuse = 8\sqrt{2} \\Adjacent =x\\\alpha =45\\\\Using\: SOHCAHTOA\\Cos \alpha = \frac{Adjacent}{Hypotenuse}\\\\Cos 45 = \frac{x}{8\sqrt{2} } \\\frac{\sqrt{2} }{2} =\frac{x}{8\sqrt{2} }\\ \\Cross \: Multiply\\2x =16\\\frac{2x}{2} =\frac{16}{2} \\\\x =8$