Circle Y has a diameter of 10 cm. Circle Y has an area of 394.38 cm². What is the circumference? Use 3.14 for 1. Round to the nearest hundredth. А 19.86cm B 39.43cm C 11.21cm 70.37cm​

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the difference of two squares is a special form that has a factorization worth memorizing.

a² - b² = (a - b)(a + b)

your equation can be factored as

x² - 16 = 0

(x - 4)(x + 4) = 0

the zero product rule tells you the solutions are the values of x that make these factors zero: x=4, x=-4.