The area of a square is 4x^2+28x+49. What expression represents the length of each side of the square?

4x^2 +28x +49=(2x +7)^2

Step-by-step explanation:

a2±2ab+b2=(a±b)2

In this case

a=2x and b=7 ...

4x2+28x+49=(2x)2+(2⋅

(2x)⋅

7)+72=(2x+7)2

∠acb = 8°

step-by-step explanation:

∠xba lies on the circle and is half the measure of the intercepted arc ax

hence

measure of arc ax = 2 × 42° = 84°

∠acb is outside the circle and is

∠acb = (arcab - arcax ), hence

∠acb = 0.5 (100 - 84) = 0.5 × 16° = 8°

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step-by-step explanation: