C. -4 because you factor and add like terms
Answer:
7 
Step-by-step explanation:
2
+ 5
= 2+5=7,
+
= 
= 7 
No you can’t square root a negative
In the case above, the length of Angle DA is 6 and angle ABD ≈ Angle CAD.
<h3>What is the angle about?</h3>
Note that:
Δ ABC , A = 90
To find length of DA :
Let Δ ACB = x
So Δ ABC = 90 -x
For Δ ABC and ADC:
Δ ADB = Δ ADC (90°)
Δ ABD = Δ DAC (90 - x)
For Δ ABC ≈ ADC:

AD² = BD. CD.
AD²= 9 . 4
AD²= 36
AD = 6
Therefore, In the case above, the length of Angle DA is 6 and angle ABD ≈ Angle CAD.
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Basically that is a certain order where you can swap around the numbers. The answer is that the problem is correct because both equal 49x