Question

The area of a circle is given by the expression 9πx- - 12πx + 4π. Find the radius of the circle, when x = 4 cm.​

Answer 1

Answer:

r=3+x

Step-by-step explanation:

Area=$\pi x^2+6\pi x+9\pi \\=\pi (x^2+6x+9)$

We know, area of a circle=$\pi r^2$

$\pi r^2=\pi (x^2+6x+9)\\r^2=x^2+6x+9$

On factorising RHS, we get:

$r^2=(x+3)(x+3)$

$r^2=(x+3)^2\\r=x+3$

Answer 2

Answer:

10 cm hope it helps you

Step-by-step explanation:

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