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The area of circle is- (πx^2+10πx+25π) Find the radius of the circle

Answer» LET R be the RADIUS of CIRCLE. GIVEN,
\pi {r}^{2} = \pi {x}^{2} + 10\pi \: x + 25\pi \\ = \pi( {x}^{2} + 10x + 25) \\ {r}^{2} = {x}^{2} + 10x + 25 = {(x + 5)}^{2} \\ r = x + 5


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